Unwitting Instigator of Doom

A character plays a small and/or unlikely but crucial role in some horrible development. The character being put on task, meanwhile, only serves to bumble in and botch the hero's hopes of a surefire victory, and worse, quite possibly deprive the story of its Happy Ending, all the while often remaining oblivious to the overall implications of the situation and their role in it. Their actions have no real necessity in elevating the drama, often taking it to Beyond the Impossible levels, making them a walking Diabolus Ex Machina.

A more temperate soul may simply wish that person were Put On a Bus prior to the critical moment, assuming that this character may have acted out of idiocy rather than malice, and that their presence and actions at that moment were their only errors. The audience, fully aware of the For Want of a Nail implications, will hate this character nearly as much as, if not even moreso than, the people who could more accurately be called responsible for whatever happened. This hatred can be understandable, in that the antagonist more directly responsible in the development is playing their role in the story, for the sake of Rising Conflict.

An Unwitting Instigator of Doom can be basically complicit with the villain, but in that case, they're generally seeing only a small portion of the picture. If they're being specifically manipulated but does not realize, s/he's an Unwitting Pawn. Other times, they're simply blundering in like a wrench in some particularly highly valued machine. Do not expect the levels of venom to differ between the scenarios. Will be seen as The Scrappy by some fans. If worse comes to worse, they may also end up as the Idiot Houdini. Expect no shortage of Fix Fics or Revenge Fics on account of this character. Often causes A Tragedy of Impulsiveness to occur.

Compare Nice Job Breaking It, Hero and Mike Nelson, Destroyer of Worlds. See also Interrupted Cooldown Hug.

Anime & Manga

 * Remember how in Dragonball Z, Majin Buu became truly evil, killed off half of the Z-warriors, the entire human race, and then finally blew up Earth? It all happened because of a few goons a few episodes back titled aptly: The Evil of Men, where they attack and shoot Bee, the puppy, and Hercule, who was in the process of rehabilitating Buu. As a consequence, Buu snapped, became Evil Buu, and we know the rest.
 * In season 2 of Code Geass, Schneizel makes a case to the Black Knights to surrender their leader Zero, who he reveals is his long-lost half-brother, Lelouch vi Britannia. While not without their doubts towards their leader based on some of his actions, they, at least counting the likes of Tamaki and Diethard, remain wary and skeptical towards Schneizel, who is rightfully suspected to be just as easily tricking them with the evidence and testimonies that he is presenting. Not more than a few moments later does Ohgi come along with his still secret love interest Villetta, a Britannian spy, with some additional cursory yet suspicious evidence the latter provided that leads everyone else amongst the Black Knights present into deciding to turn on Lelouch without giving any chance of there being a case made in his favor.
 * This is significant in that afterwards, Lelouch believes there is no turning back for himself given what he has already suffered in the past in addition to this, and basically goes from a Well-Intentioned Extremist who at least had a sensible blueprint for neutralizing Britannia and had gotten as far as setting up a legitimate international front to that end to throwing away any last inhibition he had, and using a Genghis Gambit of questionable necessity, evidently to fulfill a death wish. The person responsible for this chain of events? Happily Married to the other person responsible, Villetta, and evidently elected as Prime Minister of Japan, making him among the few characters to get a Happy Ending in a mostly Bittersweet Ending bordering on downer. A more peaceful final solution to the global conflict could have been arrived at that would have also resulted in Lelouch living on and not abandoning his loved ones, or making the questionable decision of leaving Suzaku with the role of Zero.
 * Misa Amane from Death Note does this twice, to the severe detriment of both sides. Once, it's as a Poisonous Friend to Kira,, and the other time, it's out of Mad Love to same,  . For a fervent Kira supporter, she's really a bit of a loose cannon: she never seems to fully appreciate her role in either disaster.
 * Sachiko asks her children to bring their father a change of clothes, and Sayu is reluctant to take the task. When Light volunteers, he ends up running into Naomi, learning about how close she is to figuring out an important part of how he kills people, and silencing her before she can reach L.
 * Aoba Yamashiro. Don't know him? He's a recurring background ninja in Naruto who was probably never formally introduced, databooks aside. Why is his name so well-known in some parts of the Naruto community? A single careless sentence out of Aoba's mouth revealed Itachi's whereabouts and goals to Sasuke. Following that, Sasuke tried to beat up Itachi, was soundly defeated, and pondered why Itachi would be interested in Naruto. Sure, Sasuke wasn't particularly stable before, but this huge blow to Sasuke's self-esteem was the catalyst for the event that would finally send Sasuke over to The Dark Side.
 * In an early Pokémon episode, Ash is right on the verge of capturing a Weedle, when he is rudely interrupted by a samurai, who challenges him to a Pokémon match. During said match, which is a Mirror Match between their two Metapod taking Harden commands, the Weedle manages to escape back into its tree and alert the Beedrill, who capture Ash's Metapod. In one of the series' earliest Broken Aesops, Ash is forced to learn a lesson about not making excuses about not finishing what he started, even though it was the fault of the samurai, who berates him for all of this, that Ash wasn't able to finish in the first place, all because he didn't have the courtesy to wait until Ash was done. Even after all is said and done, and Ash rescues Metapod, he's still short one Weedle, which would eventually evolve into a Beedrill.
 * Hitomi Shizuki of Puella Magi Madoka Magica. There's this friend of hers, Sayaka, who likes Kyousuke, who lost the use of his arm in an accident. Now, Hitomi did the best she could with what next to none information she had and there's also how , yet the fans still hate her. At least she isn't an Idiot Houdini, according to her and Sayaka's teacher Kazuko:  ).
 * Some may consider Madoka to be one.  Although to be fair, her mother also falls into this line for giving her that idea.
 * But really, Kyouko is to blame..
 * In Bleach, Uryu's use of hollow bait to start a hollow hunting contest with Ichigo has the unintended side effect of also drawing the attention of the Soul Society, enabling them to track Rukia down.
 * Sekai of School Days seduces Makoto because of her own unrequited feelings for him, despite actually hooking him up with another girl, Kotonoha. This action itself is what leads to Makoto developing a sex addiction, cheating on Sekai with Otome, and then Otome with every other girl in his class, Kotonoha becoming a Yandere, and well the nice boat.
 * In Bakuman｡, one factor that contributed to Detective Trap losing popularity is two other similar manga- Phantom Thief Cheater and Detective Gosuke Akechi- both of which were submitted while Mashiro was in the hospital and on hiatus, and debuted after Mashiro's release.
 * Neon Genesis Evangelion. The pilots of Evangelion Transport Neopan 400, the American Weather Bureau and the technician at Airbase Ekta 64 are never named, are never spoken of again, but ALL are responsible for the entire Bardiel Incident and Cerebus Syndrome the show developed towards the later half. This might not seem obvious at first, so here's the chain of events:  The result of not going around the suspicious-looking cloud: The End of the World As We Know It.
 * from Oniisama E. How so?
 * In Riyoko Ikeda's other manga, Claudine, we have . What did she do?   Little did she know that   The result...   Oh, and
 * from Mawaru Penguindrum.
 * Inverted with Isumi in Hikaru no Go. If he hadn't insisted on playing Hikaru,
 * In Digimon Savers pretty much every bad thing can be blamed on one villain, the Final Boss is just reacting to events. Drasil is such a self righteous blowhard that many people hated it just as much as the guy responsible for everything though, especially since much drama could have been avoided if Drasil had bothered to get off its throne years ago.
 * Sailor Moon apparently pulls a Face Heel Turn toward the end of the first season, but as it turns out she only joined the Dark Kingdom as The Mole so she could rescue Tuxedo Mask from its clutches. And then Kunzite had to blow her cover...
 * Medaka Box: Onigase, and by extension, the Public Morals Committee. Their antagonism towards the Student Council ends up getting Medaka and the other members dragged into the Flask Plan. In addition, Medaka's defeat of Unzen makes her an ideal candidate for the project and thus a target.
 * In Magical Girl Lyrical Nanoha As, Suzuka serves as one. She, not knowing about the Wolkenritter’s true nature or activities despite having met them as well as Hayate, plans to pay Hayate a surprise visit along with Arisa, Nanoha and Fate on Christmas Eve in Hayate’s. Nanoha and Fate, seeing the Wolkenritter with Hayate, then realize that Hayate is the true master of the Book of Darkness that they are searching for, and are forced into a confrontation with the Wolkenritter, who wish to prevent Hayate from being exposed. Things quickly get worse from there.
 * In Mai Otome Sifr, a cat wandering out on the hotel balcony leads to Sifr trying to retrieve it, and falling and having to be rescued by Lena, who berates her for going outside and risking being discovered. It's revealed that one of the poolgoers was an undercover Schwarz agent, and that night, a large Schwarz force attacks, succeeding in kidnapping Sifr with help from M9.
 * from Getter Robo Armaggedon.  While such a situation is really bad, there are even worse things about it:   Needless to say, It Got Worse. (Not to mention  ).
 * In Fullmetal Alchemist, Heinkel manages to corner Pride, only for some residents of the nearby slums to come by with sources of light. This enables Pride to set fire to the brush nearby, regain use of his shadow powers and severely wound Heinkel.
 * from Kaleido Star believes himself to be one of these.
 * Umineko no Naku Koro Ni has a few.
 * At the end of this nightmarish chain of events,  of all people screws the (supposed) real killer over  . Mind you, Battler didn't bother to come back for it because of said nightmarish chain of events making life at the Uroshima family mansion... unsociable.
 * At the end of this nightmarish chain of events,  of all people screws the (supposed) real killer over  . Mind you, Battler didn't bother to come back for it because of said nightmarish chain of events making life at the Uroshima family mansion... unsociable.

Comic Books

 * In Volume 5 of Scott Pilgrim, Stephen Stills tells Knives that before Scott broke up with her, he had already started dating Ramona. Knives then tells Ramona, leading her to.
 * Inverted in the Tintin (Comic Book) story The Secret of the Unicorn with the pickpocket who had been stealing everyone's wallets.

Films -- Animation

 * Buddy Pine in The Incredibles accidentally ruins an act of heroism by Mr. Incredible by getting in the way, leading to a lot of frivolous lawsuits, a Super Registration Act and the newly-married Mr. and Mrs. Incredible being forced into hiding. And then he has the audacity to say he got the short end of the stick.
 * In fairness to Buddy, the initial lawsuit which paved way for all the others didn't have anything to do with him. Mr. Incredible prevented a man from committing suicide, injuring him the process. The man sued. Buddy's well-intentioned interference in the Bomb Voyage incident and the resulting damage didn't help matters, though.
 * Of course, it's subverted by the fact that he did, so some of the hatred is probably intentional...
 * In his defense, while the ultimate outcome involved a hell of a lot of villainous overreaction, Mr. Incredible's dismissiveness of Buddy was way disproportional to the situation. Mr. Incredible really does come across like a Grade-A dick, and it's not hard to see why a fanboy's love could easily turn from worship to hate.
 * He's not the first Pixar character to fit this trope, though -- that ship sailed for good when P.T. Flea from A Bug's Life got Flik and the circus bugs ostracized by the colony and then later in the film incinerated a fake bird, thinking it was the real deal.
 * Hot Rod acted particularly useless, bordering on The Load levels during the fight between Optimus Prime and Megatron in Transformers the Movie. He promptly got himself taken hostage by Megatron, resulting in Optimus's death. And his reward for being such a useless pile of slag? He got the Matrix of Leadership and turned into Rodimus Prime.
 * In Kung Fu Panda, Sifu's goose messenger to Tai Lung's prison gives him both the means to escape and the motivation to do so.
 * In his defense, he was only told to tell the guards to be extra careful. The commander in charge of the prison was so boastful about the prison, he showed the messenger how powerful it was and ended the whole thing by patting the goose on the shoulder and letting loose one of his feathers. In other words, while he tried to deliver the message, the commander just ignored it.

Films -- Live Action

 * Star Wars:
 * A villainous example: in Star Wars a New Hope, the Star Destroyer officer who orders his subordinate not to fire on the escape pod containing C-3PO and R2-D2, thus ensuring that Luke Skywalker gets Princess Leia's message and brings about the end of the Empire. If this nameless officer had not been so frugal with laser ammo, The Dark Side would surely have triumphed.
 * In Attack of the Clones, the one thing that Jar Jar actually does in the movie, other than stand in the background, is to make a motion in the Senate to grant Palpatine emergency powers. Yes, that Palpatine. Jar Jar was already so despised at this point that the reaction was mostly along the lines of "He was the cause of all the evil in the universe? I knew it!" Some people suggest that this role was deliberately given to Jar Jar in response to his poor reception by fans. Now fans have an in-story reason to hate him. Though most people pity him for being the Unwitting Pawn.
 * In all fairness, the entire galaxy is comprised of unwitting pawns who played right into Palpatine's masterplan. Even Padme, who disagrees with some of Palpatine's claiming greater executive powers and continuing the Clone Wars, didn't realize where he was going until late Episode 3, and was the one who arranged the Vote of No Confidence on Chancellor Valorum, allowing Palpatine to take power in the first place. It should be noted that she did that at Palpatine's suggestion, though.
 * In the Kevin Costner version of Robin Hood, his blind manservant Duncan gallops into Sherwood Forest in order to tell his master that Marian has been captured by the Sheriff; only for the bad guys to follow him straight to the outlaws' hideaway and start to massacre everyone there. Beyond getting ushered about by either Robin or Marian, it's the only thing he ever does in the movie.
 * In Wrong Turn 4 Bloody Beginnings, a prequel to the Wrong Turn series, one of the characters beg someone not to kill the inbreeds. They spare their life, but in return are responsible for nearly every single death in the films.
 * In The Lord of the Rings: The Two Towers, at least in the film version, Faramir is one. He is prepared to shoot and kill Smeagol for entering the Forbidden Pool and seemingly allows Frodo to call him out of the pool, but immediately captures him upon his exit. Smeagol thinks Frodo lied to him and, enraged by this apparent betrayal, regresses into his Gollum persona and starts plotting his and Sam's deaths for the sake of retrieving the Ring.
 * In retrospect, this being a bad thing depends on Frodo's willpower stat at higher levels of health, stamina, and morale. At the end of the journey, Frodo gives in; it's somewhat pathetic, but considering his unholy journey to hell-on-earth barefoot and starved, every step in the volcanolands seems like a miracle, so it's no wonder that he puts on the ring where it's influence is the most powerful and turns invisible - to everyone except Gollum. Who accidentally destroys himself and the ring. So if Frodo could have had more willpower without Gollum's spider-venom backstabs, then yes he did lose a finger for Faramir's paranoia.

Literature

 * In the former trope-naming incident, from the Sherlock Holmes story The Final Problem, a Swiss messenger in Moriarty's employ catches up to Holmes and Watson with a message saying that an Englishwoman at the hotel they're staying at is on the verge of death and wants to see an English doctor. Watson obediently returns to the hotel, unknowingly
 * It is, however, implied that
 * Catelyn Stark in A Song of Ice and Fire. Twice, but is more cited than, Despite the fact that the Tyrion incident was the casus belli of the civil war that has made the entire world turn to shit ever since.
 * Fans often cite as a crucial step leading up to the Red Wedding, but there are parts of the text suggesting that said wedding was already being planned before it happened. Both Lord Twin Lannister and the Stark's treacherous ally   appear to be planning something around the time of his release.
 * The irony of Catelyn is that, in most other fantasy worlds, she and Ned would be the most sympathetic characters in the entire story, and the clear virtuous protagonists of the piece. In the Crapsack World that they live in, though, they are either directly or indirectly the cause of something like 90% of the tragedy that follows.
 * Also Sansa Stark with the whole Lady affair, or running off to Cersei when she did. Forgiven by many only because of what happened to her after that.
 * When she was a girl, Lysa Tully was in love with her father's ward Petyr Baelish, who was light-years below her in social status so a marriage was impossible. Also, he was in love with her older sister Catelyn. So one night after watching Petyr dance with Cat and get very drunk after Cat wouldn't kiss him, . Shortly after this, Cat's engagement to Brandon Stark was announced and (understandably from his point of view) Petyr challenged him. Short scrawny 15-year-old Petyr nearly died fighting tall strong 20-year-old Brandon and was promptly thrown out for this and for . This humiliation was Petyr's Start of Darkness, turning him into the villain responsible for . Well done, Lysa!
 * Harry Potter: Bertha Jorkins in Book 4. Doesn't appear 'on-screen', doesn't have any speaking roles, dies long before Book 4, but is absolutely crucial in giving The Big Bad the capacity to put together his plot -
 * Marietta Edgecombe. She revealed the existence of Dumbledore's Army, thus leading to Dumbledore having to flee Hogwarts and Umbridge taking over.
 * However, there are actually plenty of others who all contributed indirectly to : Dumbledore, Snape , Harry , even Sirius himself And bigger than any of these others would be Cornelius Fudge and Umbridge for why everything had to be so damn circumspect in the first place.
 * In Battle Royale,
 * "Papa" Monzano in Cat's Cradle inadvertently brings about.
 * May not have been unintentional though. He knew exactly what the little crystal could do and even uttered the Bokonist phrase for committing suicide, "Now I destroy the world…" Consider also that the whole thing is largely a parable about the insanity of nuclear arms proliferation and the dangers of what happens when a truly irrational madman gets his hands on a weapon of mass destruction.
 * A more accurate example from the book would probably be whoever failed to perform proper maintenance on the fighter plane which crashed into the side of the castle.
 * Lucy's mother in Dracula is partly responsible for killing Lucy by.
 * In The Wise Mans Fear, The Cbaeth creates these by acting as a malicious oracle or saving peoples' lives.
 * Jacob in The Red Tent Because he demands an outrageous bride price for his daughter (after a sarcastic comment by Joseph), because of a combination of greed and Overprotective Dad factor, his sons murder Dinah's True Love, and all the other Shechemite men. Jacob calls his sons out on it and dies full of regrets.
 * Curley's wife from Of Mice and Men wanted to have a friendly conversation with Lennie, despite George's orders to Lennie to stay away from her. She eventually took advantage of Lennie's foundness of soft things, and offered Lennie to touch her hair; this soon lead up to Curley's wife getting scared and beginning screaming, which in turn made Lennie scared that George would hear her and squezed her hair tighter. Guess who winds up his or her neck broken. The death of Curley's wife quickly lead up to the novel becoming a Shoot the Shaggy Dog Story.
 * Inverted in the Star Wars novel Death Star. Two utterly trivial characters from the first film (the guard who says, "Close the blast doors!" too late, and the gunner who says "Stand by... stand by....") turn out to have
 * In Death: This trope has happened a few times. Vengeance In Death had a brilliant plan to catch the murderer ruined by a robot poodle that caused a chain reaction of events that caused the cops to reveal themselves and for the murderer to spot them and run for it. New York To Dallas contains two instances of this. The first one had a brilliant plan to catch the murderer's partner ruined by a dog that caused a kid to almost get run over by a car, a cop having to save the boy's life and reveal himself as cop, causing the murderer's partner to spot them and run for it. That instance got subverted by the partner getting caught despite a chase anyway. The second instance had the cops closing in on the murderer, only for the murderer to get away. How? The murderer was out shopping when he overheard a conversation between staff member and a stock boy about cops. The staff member recognized an undercover cop working in the area and he was just telling the stock boy about how this cop came to a criminology class and how cool he is. The murderer naturally chose to run for it. Clearly these minor characters would not get a lot of sympathy from readers.
 * In Halo Contact Harvest, negotiations between Humanity and the Covenant are taking a nasty direction (the Brutes demanded the Earth and everything on it, humans said no). A frightened Grunt attacks a Marine, an act that triggers the entire Human-Covenant War and everything connected to it. The Halos, the Forerunners, the Flood, the Spartans like Master Chief -- it's possible none of them would have been discovered or created if that Grunt had been less impulsive.
 * Ciaphas Cain has his own personal version of this trope in Toren Divas who manages to be both his best and most hated friend. The best example is in the starship at the start of Death or Glory: while Cain and Jurgen struggle to get out of a room where the hull has been breached, Divas' attempts at being over-dramatic knock some guardsmen off balance as they hold open the emergency doors, trapping Cain and Jurgen and forcing them to get into a lifepod, making planetfall deep in ork-held territory. This sets off the whole plot, though as that involved Cain and Jurgen's flight to safety snowballing into liberating the planet, the people of Perlia would probably have thanked him.

Live Action TV

 * Wesley in Buffy the Vampire Slayer revealed that Faith accidentally killed someone. The rest of the team is already on-board with helping her deal with her issues and giving her the support and acceptance she needs in order to not fall to the dark side. Wesley's response on the other hand is to call in some goons and try to ship her to England to be locked away forever. By the end of the episode, she doesn't trust any of them, resents all of them (because she thinks they want her to just be like Buffy), and has taken a job as the Big Bad's number two.
 * Fortunately, when almost the exact same situation comes up again on Angel, he has learned enough to actually trust the protagonist and go with his plan. This time it leads to Faith turning herself in and beginning her path to some measure of redemption.
 * In murder mystery Harpers Island, nine-year-old Madison is kidnapped by the Ax Crazy Big Bad, John Wakefield. When rescued, she goes along with the lies Wakefield told her to tell the others -- specifically that it was the Sheriff who kidnapped her. Even though she knew that Wakefield was evil. This gets several people killed and Madison became The Scrappy.
 * Due to a lot of Time Travel and Anachronic Order being involved, the Blue Senturion in Power Rangers Turbo is often accused of being this, the negative result being Zordon's death. He'd come back in time a thousand years to warn of a massive war a year later -- but the villains intercepted him, took the message, then wiped it from his memory, resulting in the evil side of the war being way more prepared than the good guys.
 * Of course, time travel being what it is, no one really knows how different the end result would have been.
 * Power Rangers RPM: To escape from the research facility she spent most of her pre-series life confined to, Doctor K decided to release a sentient computer virus her captors had her design for them. She intended to keep it to the facility's computers, but two guards caught her before she could finish installing the firewall, ignoring all her protests. Cue the destruction of human civilization outside of Corinth City. In Power Rangers.
 * In the BBC's Robin Hood the titular character is trying to make a tentative alliance with Isabella, the new Sheriff of Nottingham (and his ex-girlfriend) despite the grumblings of the other outlaws. His reasoning is sound, and after striking a deal with her he asks Little John to escort her safely home. For no reason whatsoever, John decides to tell Isabella that Robin "has eyes for Kate" (a fellow outlaw). This achieves nothing except pissing Isabella off and leading her to doubt that she has any kind of power over Robin. She turns on him at the next available opportunity which leads directly to two outlaws' deaths. Nice job antagonising the valuable ally, John.
 * Degrassi the Next Generation gives us Paige Michalchuk, who gets her friend Terri drunk before a dance and ends up with the guy Terri wanted instead. Later on, Terri thinks she'll never find a man and ends up with abusive boyfriend Rick. Later, Rick comes back and Paige gets to be an inversion of this trope, albeit ultimately subverted because someone else pisses Rick off enough that he starts shooting people.
 * In the second season of Criminal Minds,  The construction crew couldn’t have waited 30 minutes for the damn police, swat, and FBI to finish?
 * Octavia in Rome may have been indirectly responsible for

Theater

 * Zeroth Law of Trope Examples: Romeo's servant Balthasar in Romeo and Juliet, when he brings his message to Romeo telling him of Juliet's death. Sadly, the friar's letter telling him that the death was faked does not get through - so there are two Swiss Messengers, the one who delivers the wrong news, and the one who doesn't realize how important the real news is, and fails to deliver it. Actually seems to have achieved some degree of Popcultural Osmosis, which runs counter to the norm for an author so prone to Everybody Knows That.
 * In Oscar Wilde's An Ideal Husband, the scatty Lady Markby brings a friend to a party, appearing in two scenes in the first act, and never appears onstage again. Said friend turns out to know their host's dirty secret, thus causing the events of the entire play.
 * Cyrano De Bergerac: Hilarously subverted by De Guiche: he is a villain who unwittingly derails his own plans: At Act I Scene IV, he utters a simple Dare to Be Badass to De Valvert, a small but crucial gesture that sets events that result in the derailment of his own plan to marry Roxane with De Valvert so de Guiche could bully her to be his mistress.

Video Games

 * In Dragon Quest IX,.
 * Mass Effect 2 has a slight case of this in Joker. Shepard dies at the start of the game specifically because Joker refused to leave the Normandy when it was going down in flames. Shepard was forced to pull off a Heroic Sacrifice for him. Despite this, Joker is still a popular character, but it did earn him some haters.
 * Shepard wasn't under any obligation to save Joker, so it's really his/her own fault being too sentimental about his/her crew.
 * S/he got better...
 * When you become captain of a ship, you take responsibility for her as well as anyone onboard. It's a long-time naval tradition, and it likely persisted in the Space Navy. What kind of a captain abandons a crewmember? Besides, Shepard probably thought Joker couldn't make it on his own due to his disability. And Joker's a friend. Throw in the fact that Joker kept the badly-damaged Normandy flying for long enough for the rest of the surviving crew to abandon ship, and you realise that Shepard gave his/her life to save the guy that saved everyone else.
 * The Ace Attorney games have one (although it's more attributed to the series being a Long Runner more than anything):  is indirectly responsible for the DL-6 incident, thanks to
 * And to really make things worse, the DL-6 Incident lead to Poor 's got a lot of blood on  hands.
 * Jake Marshall can be considered one for Case 1-5. He approaches Bruce Goodman, asking him to re-open SL-9, but Goodman refuses. Marshall then steals Goodman's ID to retrieve the evidence himself, prompting Goodman to have to enter the evidence room with in order to complete the transferal. Not realizing he was with Neil Marshall's true killer, Goodman changes his mind and suggests reopening the case, . Marshall thus, either by stealing Goodman's ID or planting a seed of doubt in Goodman, indirectly caused Goodman's death.
 * Final Fantasy X: So Yuna and her friends have uncovered the truth about, and are getting ready to , when intervenes and interrupts the ritual. It Gets Worse when,  Needless to say, with this action,
 * In the "Invasion of the Firelands" quest chain in World of Warcraft, the players can become one in a rare instance in which they cause disaster without being an Unwitting Pawn. Shortly before the attack on the Firelands is about to begin, Hamuul asks the player to investigate a Druid of the Flame nearby. The Druid of the Flame, Leyara, attacks the player and Hamuul, badly burning Hamuul and preventing the protectors of Hyjal from going on the offensive until the player gets enough Marks of the World Tree to unlock the next phase of daily quests.
 * Ryousuke Katayama of Corpse Party is a weird example, in that it's not exactly his fault. His friend Ohkawa, however, . This works about as well as you'd expect. Ohkawa . Ultimately, Kizami.
 * During Hanako's route in the Visual Novel Katawa Shoujo decides to teasingly question her and Hisao about their realtionship as a result of this queston
 * In Bastion  indirectly caused The Calamity by

Web Comics

 * In Kid Radd, two Moderators are given a large sum of money in order to hire an assassin to kill Radd, as Captain QB can't be directly implicated in illegal activities and needs to use a proxy. They reason that it can't be hard to kill someone in jail (as Radd is being imprisoned for illegally entering other games)), and hire Kobayashi the discount ninja so that they can pocket the rest of the money. Radd survives the assassination attempt and Kobayashi becomes a recurring character who later meets up with Gnarl and, while training together, stumbles upon.
 * In the Jack Chick tract Fatal Decision, Brutus, an orderly on the brink of being fired for rudeness to patients, makes hints that John shouldn't trust Dr. Bowers, leading to John destroying the vaccine and dying of his disease.
 * The devils often invoke this trope, choosing someone who has an incidental relationship to the person whose soul they want to claim. In "The Assignment" they succeed in convincing Charles Bishop's subordinate's wife to badger him out of witnessing to his boss. They try to distract Cathy with a boy, only for it to fail when he proves to be a Jerkass, and try to have the previously mentioned subordinate call Bishop with a sales proposition, only for the angels to thwart this attempt twice. Charles ultimately dies in his sins, making the first example a successful one.
 * In Kevin and Kell, Nick and Ki's arrival in Domain by way of interdimensional travel disrupts the balance between the animal- and human-dominated worlds to the point at which the other two humans living on the animal side are forced to leave lest the world suffer instinct loss..
 * Miko Miyazaki from The Order of the Stick, having already lost her Paladin abilities through the unwarranted execution of of Lord Shojo, ends up destroying the Sapphire Gate, having once again misinterpreted what the gods wanted of her. Had she not been so hasty in doing this, the ghost of Soon Kim could have permanently ended the threat of Xykon and Redcloak, who, themselves, were aiming for the gate, anyway.

Western Animation

 * A strange example of a fictional character ending up being one for the real-life events. The Ren and Stimpy Show had the minor character George Liquor getting brutally beaten up by Ren in the episode "Man's Best Friend". Said scene was later one of the reasons for creator John Kricfalusi's firing.
 * The Earth King informed Azula (disguised as a Kyoshi Warrior) of the invasion of the Fire Nation,cue next season where the invasion force finds all royalty in hiding.
 * The Ice King from Adventure Time interferes with Finn's attempt to destroy the Lich from reaching the Well of Power and reaching his full power by pestering Finn and Jake in an attempt to gain their blessing to wed Princess Bubblegum. As a result, the Lich, having regained his full power by the time Finn and Jake finally reach him, ends up jobbing Finn destroying the Gauntlet, the one weapon able to destroy him outright, forcing Finn to find an alternative. It doesn't stop there, though. The Ice King, who apologizes for having just kidnapped the Princess, accidentally drops her into the Well, which, in the subsequent episode, has the effect of melting her. She is saved, but is possessed by the spirit of the Lich. After being frozen with help from the Ice King, she shatters, requiring medical attention to be put back together. Part of Bubblegum is missing though, causing her to come back as a 13-year old, which later results in Earl of Lemongrab assuming the throne, if only for an episode.

Real Life

 * Samuel Taylor Coleridge had a vivid dream, got up and started writing it down as the epic poem Kubla Khan, but then there was a knock at the door, and a man from the nearby town of Porlock kept him talking just long enough to forget all about the dream and he never finished it. The Person from Porlock is now literary shorthand for an unwanted visitor...
 * Though some have theorized that Coleridge never intended to finish the poem (or that it was finished already), and he made up the story of the visitor just to mess with people.
 * It doesn't help that, Coleridge was a heavy opiate user, the "dream" was something more of a "drug-induced vision," and the man from Porlock may or may not have actually been there. (cue images of a poet standing on his doorstep talking to nobody while hazy visions of Kublai Khan's utopia dissipate into the aether).
 * Of course, some think it was a guy named Dirk Gently.
 * Or Jack Constantine.
 * Andy Dick. At a 1997 Christmas party, he reintroduced Brynn Omdahl, wife of Phil Hartman to cocaine, leading to his death.
 * Floyd Wells. He told fellow cons Perry Smith and Richard Hickock that a farmer he worked for named Herb Clutter kept a safe hidden with plenty of cash inside. As it turned out, there was no safe. It was this false info that led Smith and Hickock to massacre Mr. Clutter and his family, the basis for Truman Capote's In Cold Blood.
 * A rare inversion in Stanislav Petrov. While monitoring a satellite for the Soviet early warning system of a nuclear attack, he received a report of five inbound ICBMs. He decided it didn't make sense for a US first strike to be composed of only five nukes, and logged it as a technical error. Had he not been so cautious, World War III surely would have erupted.
 * The failure of the Jay Leno Show on primetime had this effect on Conan O Brien's tenure as host of The Tonight Show, as it damaged local 11pm newscast ratings, as well as Conan himself, leading NBC to move Jay and his show back to his old 11:35 spot, and pushing Conan just past midnight. Conan, not wanting to tarnish the legacy of the Tonight Show, wanted no part of the agreement, and was subsequently evicted from the show, with Jay back as host.
 * Senator Stephen Douglas, the man responsible for the Kansas-Nebraska Act. Originally, his intentions had simply been to get a railroad to California built, which would start in Chicago, Illinois (his home state). To do this, he proposed splitting the remaining unorganized chunk of the Louisiana Territory into the territories of Kansas and Nebraska. Pro-slavery Southerners slipped in a part saying that the legality of slavery in each territory would be decided by the voters there. Nebraska banned slavery without much fuss, but pro-slavery advocates from Missouri flooded into Kansas to support slavery, and the rest is history. Douglas himself has been branded pro-slavery for years afterward following the fallout, with historians often leaving out that it was the South that suggested the decision of slavery by popular sovereignty and that Douglas himself wanted to build a railroad to California, obviously having no idea that the first planned transcontinental railroad would cause the biggest schism ever to hit the United States over completely unrelated circumstances.
 * In 2007, Adult Swim launched a guerrilla marketing campaign for the Aqua Teen Hunger Force movie featuring battery-powered LED placards resembling the Mooninite characters being placed in numerous places around the US. However in Boston, police officials mistakenly thought that the LEDs were bombs, and treated the whole event as such. This event would turn out to known as the Boston Bomb Scare, which lead to legal implications being placed on Turner Broadcasting, the internet to make mock "Never Forget" memes, and forced then-current Cartoon Network head Jim Samples to step down. It wouldn’t be long after until fans began to realize that Cartoon Network would not be the same since the incident. Not because of any legal incidents, but because Sample’s replacement, Stuart Snyder, has since become the instigator of the channel’s infamous Network Decay with the increase of live-action sitcoms and reality shows on the channel.

Sports

 * Fred Merkle. Had This Wiki existed one hundred years ago, no further explanation would have been needed. Basically, Merkle was a baseball player for the Giants back in the early twentieth century. In the bottom of the ninth inning in a game against the Cubs, there were two outs and the score was tied, and Merkle was on first base (someone else was on third). Another player scored, scoring a game-winning run, but in the excitement Merkle never actually stepped on second base. Thus, a player for the Cubs stepped on second base and called Merkle out, thus nullifying the run. As this game was played before electric lighting, the game was declared a tie. Thus, the Giants and Cubs ended the season tied for first place, requiring a rematch to determine who would go on to win the pennant. The Cubs won. The sheer amount of hatred directed at Merkle's one mistake was astounding, especially considering that he was far from the only person who cost the Giants the pennant.
 * It wasn't excitement that kept Merkle from stepping on second; the fans stormed the field, and he ran for the clubhouse for his own safety. The game was called a tie after the Cubs player somehow made the play in that mess because they couldn't clear the field. It should also be noted that, since this behavior by the fans was quite common back then, such a force out had never before been enforced under those conditions. All of this really makes Merkle one of the worst cases of Mis Blamed in sports history.
 * And we'll all forever Have a Gay Old Time out of that one ("Merkle's Boner", anyone?).
 * Steve Bartman. As the story goes, the Chicago Cubs were on their way to their first World Series since 1945 when hapless fan Bartman interfered with a foul ball, costing the team a precious out. What gets overlooked is that after the incident, Chicago still led 3-0 with one out in the 8th inning, and could have easily won the game if not for a bout of spectacular incompetence: a wild pitch, an error on an easy ground ball that could have ended the inning, two intentional walks that backfired to the tune of four runs allowed, and other hard hits. The tense 3-0 game became an 8-3 laugher. Oh, and that was only Game 6 of a seven-game series; the Cubs could have still made the World Series by winning Game 7, at home, with their best pitcher going. That didn't work out either.
 * Similarly, Bill Buckner's epic error in 1986. History little notes that the Red Sox had the Mets down to their final out, and three times down to a final strike that would have brought Boston a long-awaited championship. Buckner's famous gaffe was made possible only by three consecutive singles, a wild pitch, and pitcher Bob Stanley failing to recognize that baserunner Ray Knight had strayed so far from second base he could have been picked off easily. And, like the above example, this loss only tied the series at 3-3; the stunned team could have regrouped and won the next day, but did not.
 * In the bottom of the ninth inning of game six of the 1985 World Series, umpire Don Denkinger called Kansas City Royals baserunner Joge Orta safe on a close play at first base. ABC's replay showed that St. Louis Cardinals pitcher Todd Worrell managed to get to first base and took the toss from first baseman Jack Clark at the base before Orta reached it. Cardinals fans will blame this call for costing them the championship and Denkinger was hounded by them for years. However, Orta was the first batter of the inning. The Royals eventually loaded the bases and it was the fourth batter of the inning, pinch-hitter Dane Iorg, who got the hit that scored two runs to give Kansas City a 2-1 victory. The Cardinals could have still won the series the next night in game seven, but were still unhinged by the events of the previous night and the Royals won 11-0, claiming the only World Series title the team has ever won. It didn't help that the Cardinals had won the first two games of the series in Kansas City and held a 3-1 lead in the series after five games, making the Royals the first team ever to come back from a 3-1 series deficit after losing the first two games at home. Oh, and Orta wasn't even on base when the winning run was scored...he was thrown out at third on a poorly-executed bunt play.
 * For all the flack Lebron James got for the Miami Heat losing the 2011 NBA Championship. it may have been Dwayne Wade that started the collapse. Miami looked to have a 2-0 lead over Dallas when Wade hit a three-pointer to put them up by 15 in the fourth - and he chose to taunt the Mavericks by posing in front of their bench. Dallas mounted a furious rally to win that game, posted another comeback in Game Four and ultimately took the trophy right from under the anointed Heat's collective noses.