Gut Punch

""The kids in the audience were stunned. There was almost complete silence. The movie had stopped being delightfully scary about halfway through, and had become unexpectedly terrifying.""

- Roger Ebert, on Night of the Living Dead.

Say you're watching that new thriller that everyone's been talking about. You've heard nothing but praise for its uncompromising brutality, Emotional Torque, and ability to mess with the audience, but so far nothing you've seen gives even a remote indication of why--

Whoa. That's why.

You've just been hit with the Gut Punch: the single moment when a work makes it abundantly clear that the gloves are off. This is where you figure out that playtime is over: Plot Armor has been switched off, the hero won't be getting up from that No-Holds-Barred Beatdown anytime soon, Anyone Can Die, and the bad guy winning has become a very real possibility. Maybe It Got Worse, maybe it was always that bad and just forgot to tell the audience. Either way, this is a clear indication that the creator has decided to get dangerous and that those who haven't prepared will not be pleased.

This can be a somewhat subjective trope, but the general idea is that a single moment instantly and clearly establishes that the tone of the work as a whole is fundamentally darker than what the audience has been led to expect. If there's a particularly dark moment in a show that then reverts to being somewhat lighter, it's not this trope.

Sub Trope of It Got Worse, Cerebus Syndrome, Darker and Edgier, and Mood Whiplash. Super Trope to Sacrificial Lion, Wham! Line, Kill the Cutie, Decoy Protagonist, and Wake Up Call Boss. The Knight of Cerebus, Tragic Monster, and the Hero-Killer are three characters extremely likely to cause this. Sometimes related to Player Punch.

Spoilers ahoy!

Anime and Manga
"Legato: ''If I'd felt like it, all the people within a 50 meter range, in 0.2 seconds, would all be dead... In the next ten minutes, you'll learn the true meaning of hell.""
 * Legato's introduction in Trigun pulls this off in a single frame. It's a bright and sunny day, the kids are playing with Vash. Then out of nowhere, Legato. He killed and ate the friendly shopkeeper Vash was just speaking to, and feels it would be a downright shame if the little girl Vash just bought an ice cream for would have to be next. The entire scene is completely horrific, but what cements it as this is the opening shot of the usually lighthearted and goofy Vash looking legitimately terrified for the first time in the series that clearly indicates exactly how bad things are about to get.


 * It's also implied (and stated in the manga) that the hot dog he gave the little girl was made from the remains of the aforementioned shopkeeper. Yikes.
 * Gantz was already a pretty dark series, but it still manages to give us this somewhere around the end of volume 9 with the death of  The fact that   takes a level in badass afterwards does nothing to mitigate the new knowledge that Plot Armor has ceased to exist.
 * Neon Genesis Evangelion pulls this with . Hey, it looks like the cast is starting to resolve its issues and the show might be heading towards general mental stability! You know what would be really fun? How about breaking out the Trope Namer for Mind Rape?
 * Arguably, the fight with the 13th angel could count as well. It's generally agreed by fans that this is the point in the series when things started to take a turn for the worse.
 * A second example, from The Movie:, after finally recovering from the aforementioned Mind Rape, takes a level in badass almost instantly and starts tearing through the new Eva units with absolutely no trouble. Except that they survive. What happens next is so horrific that the mere sight of it is enough to bring   all the way from temporary Determinator across the Despair Event Horizon and beyond, setting the tone for the rest of the movie quite nicely.
 * Fullmetal Alchemist has this with the death of.
 * Before that, there was the Fate Worse Than Death of
 * The Wham! Episode of Puella Magi Madoka Magica where.
 * The deaths of in Death Note.
 * Chirin no Suzu has the scene where a wolf kills a lamb's mother.
 * Ben-To episode 10
 * Given that Berserk starts In Medias Res and a big chunk of the story, a twelve volume long prologue, shows us how everything came to be in first arc, which showed Guts as a dark, brooding and ruthless warrior on the brink of madness due to his obsessive revenge against Griffith, we thought that the flashback would be self-explanatory once we got to that point... Until we found out just how much everything went horribly wrong once the Eclipse went down, which involved  Wow.
 * Bleach: You know how fans joked that Tite would never kill off any main character or hero? Yeah, um,
 * The entire beginning of the final arc is a huge change in how Bleach generally works. Ivan is introduced as an arc rival to Ichigo and Luders is introduced as that underling he doesn't get along with.  Characters who leave are never mentioned again?
 * Mai-HiME has the loss of Akane's child, and
 * In the Wham! Episode of Mai-Otome, the turning point in Arika and Nina's characterization is.
 * In the Kuroshitsuji manga, there is the time when after some events that were already horrible on their own, Ciel goes into Heroic BSOD and

Fan Fic

 * The last book in the Tamers Forever Series: Silent Sorrow takes this trope Up to Eleven.

Film
"This was in a typical neighborhood theater, and the kids started filing in 15 minutes early to get good seats up front."
 * The first 45 minutes of Audition could easily be mistaken for a romantic drama in which everything is slightly... off. Then we get Establishing Character Moment, which is so scary that it turns the next half hour of violence-free romance into pure terror.
 * The original Night of the Living Dead gets two back to back in the same sequence. First we get something that looks like this, specifically the deaths of . In any other horror movie made at the time, that sequence alone would have been enough to qualify as this trope. It doesn't, but only because the real punch comes immediately afterward when we see an extremely graphic (for its day) image of the zombies chowing down on the recently charred corpses. Roger Ebert's reaction provides the page quote.
 * Adding to it was the fact there were children in the audience because this was before the MPAA rating. From his review:


 * It can be argued that Night of the Living Dead was one of these for the entire horror genre.
 * This is a major part of the reason for the fame of Psycho's iconic Shower Scene.
 * Sympathy for Mr. Vengeance has, setting off the cycle of brutal revenge on both sides.
 * The events of Kung Fu Panda 2 actually start with Shen killing Master Rhino with his cannon in order to show how evil the peacock and his wolf army actually are.
 * The Dark Knight announces rather loudly that the gloves are off when we see The Joker's video of himself killing.
 * Gran Torino gives you one when Sue returns from the Hmong gangs.
 * Clint Eastwood seems to really like this trope: Million Dollar Baby is a story of a waitress who wants to improve her life: she learns how to box and manages to achieve international fame up to fighting for world title.
 * Drive shifts fairly abruptly from being a low key character study to being a Bloodier and Gorier Roaring Rampage of Revenge crime story when  is killed, to reiterate the shift for anybody who wasn't clued in by that they   a few minutes later.
 * The death of in Transformers: Dark Of The Moon.

Literature

 * Battle Royale has this by way of, who gets killed off halfway into the book to establish that, yes, Anyone Can Die.
 * Harry Potter: at the end of book 4 is a prime example that started the series rocketing towards Darker and Edgier territory.

Theatre

 * Romeo and Juliet is basically a Romantic Comedy... right up until the fight between Mercutio and Tybalt. It Gets Worse from there.
 * Into the Woods appears to be a basic fairy tale, Act 1 ending on a high note with a nice musical number—and then suddenly, Act 2 slams in, viciously deconstructing fairy tale tropes and killing characters left and right.

Video Games

 * Guild Wars opens in the fairly idyllic area of Ascalon - grass and flowers are everywhere, and enemies are easy and will generally not attack you unless provoked. Then the Searing happens, and you get out of the prologue.
 * Final Fantasy VI has one of the most famous video game examples, which occurs halfway through when
 * Final Fantasy VII features the reveal of the Big Bad's plan to end all life, his successful acquisition of the MacGuffin he needs to do it, and the death of the only character with a means to stop him, all in short sequence at the end of Disc 1 of 3 (which had been largely light and partly humorous up this point except for some angst in the backstories of party members).
 * Tales of the Abyss starts out as a typical cliche packed Shōnen adventure. Then, about a third of the way through the game, The Reveal occurs and we are subject to one of the most vicious examples of Break the Haughty ever seen in a game.
 * Vindictus starts out in a moderately Dark Fantasy world, but doesn't initially explain how it turns into the Low Fantasy Crapsack World that it's advertised as. Then less than halfway through the third major zone, Ainle, . And the name of the mission in which this happens? "Wake Up Call." Things don't really improve from there.
 * Yggdra Union waits until the player has been lulled into a suitable sense of security before it shows its true colors—it seems upbeat enough for a medieval war game for two thirds of the plot. Then there's Battlefield 40, where you begin your invasion of The Empire for the sake of protecting The Kingdom, and . And it gets worse very quickly from here.
 * Digital: A Love Story starts off as a simple 1980's email simulator, then . They then receive an email from the websites administrator that reveals  and things get very dark very quickly.
 * ZODIAC Virgo from RefleX delivered two substantial of these. The first when it shot down Cancer from behind and the second when it.
 * World of Warcraft gives you the events of the Wrathgate. . You now see it cause the senseless and meaningless deaths of some of the Horde's and Alliance's greatest heroes and shatter any chance of peace between the two factions. Oh, and if you're playing as Horde, you helped create, in one of the more light-hearted questlines that go all the way back to the first levels.
 * In Mass Effect 1, you have a few missions trying to find out what Saren is up to, and a ton of sidequests mowing down violent criminals and terrorist cells with impunity. Then you have Virmire.

Webcomics

 * Order of the Stick: Due to Xykon's Laughably Evil tendencies, it's very easy to assume that he's not that much of a threat. However, during the invasion of, he swiftly reminds the audience exactly how dangerous he is by.
 * In Our Little Adventure, the adventuring group has had a fairly easy time questing and defeating monsters...and then a special Monster of the Week appears and.
 * Homestuck is pretty light material... right up until  promoting himself instantly to Big Bad.
 * This also very suddenly demonstrates the darker turn the comic takes in Act 5 Act 2. (Spoilers in link)

Western Animation

 * Re Boot: When Megabyte rockets Bob into the Web during their Enemy Mine situation, stranding him there before starting his conquest of Mainframe. We're led to believe that Guardian Enzo can protect the city, but then he loses a Game, his eye, and gets Time Skipped into a Nineties Anti-Hero.
 * Avatar: The Last Airbender has an unusually late example at the end of season 2. Up until that point, the show had proven its willingness to tackle difficult subjects, but always ultimately ended in a relatively lighthearted way. In the season two finale, Where Season 1 ends with the heroes victorious, season 2 ends with them battered and broken and having lost much that they had gained.