Kick the Morality Pet

"The Flash: Can't do it, can you? I'm the last piece of your conscience. That's the one thing you'll never do. Lord Superman: I've done a lot of things I thought I'd never do these last two years. One more won't hurt."

- Justice League -- "A Better World (part 2)"

The Hero has been taking a turn for the Anti-Hero lately, exploring The Dark Side with the help of an Evil Mentor, learning anger, or generally indulging in less than heroic behavior or abilities.

On the way, their friends will try to stop them, but the hero will ignore them because they're enjoying themselves too much. They're this close to Jumping Off the Slippery Slope thanks to Evil Feels Good and assorted perks to lapsing their morality, and just when it looks like they're about to Kick the Son of a Bitch and give him what's coming to him, they either miss the intended target and hurt an ally by accident, or abruptly realize they're being an abject Jerkass and attacking someone who's trying to help them for no good reason.

They've just hit the nadir of this downward spiral and the start of their return to the straight and narrow. By hurting their friend, possibly the Morality Pet, Love Interest, or The Chick for extra oomph, they do the one thing capable of prompting a Heel Realization before they do a full Face Heel Turn (or cement the turn, at least). Cue cries of "What Have I Done?!" and "What Have I Become?!?" while shedding Tears of Remorse and Cradling Their Kill, they'll say they're sorry and try their hardest to resuscitate the dog they've just kicked.

If they weren't evil beforehand, whoever was inducing them to this behavior will quickly prove it by not turning back like the hero just has. They'll likely scold the hero for chickening out, and remark that evil does not spend its time petting bunnies (well, not during weekdays anyway). If powers are involved, expect them to go Drunk on the Dark Side and/or One-Winged Angel.

Compare Villainous BSOD. Also, some may be too far gone for this trope to pull them back to their senses, which will result in either an Ignored Epiphany or the character displacing the guilt onto someone else. See also Minor Insult Meltdown and Moment of Weakness. Not to be confused with kicking a dog that was too dangerous to kick, or kicking the son of a bitch.

Anime and Manga

 * Fullmetal Alchemist:
 * Chapter 95:
 * Greed, after killing a member of his old True Companions.
 * In Mahou Sensei Negima, Negi goes on a Black Magic fueled rage, he indiscriminately attacked everyone around him. It was only after he came within inches of killing one of his own (defenseless) students that he snapped out of it.
 * Happens to Agnes in The Familiar of Zero (at least in the novels), when Saito, Louise and everyone is fleeing the country to save Tabatha who is about to meet a Fate Worse Than Death at the hands of her uncle, the King of Galia. Anies had orders to only arrest the group and no intention of harming them, but as soon as she sees her lifelong nemesis  responsible for her Doomed Hometown, whom she thought was dead, she snaps and opens fire. The shock from the realization she nearly killed Saito in the process, whom she trained and considered as a friend, has her realize that even if she killed her nemesis, other people would hate her in turn, so hatred and revenge are meaningless and that someone has to take it on himself to end the hatred here and now. She didn't forgive him, but is at least able, now, to look at his face without feeling murderous urges.
 * Or at the very least, not act on them.
 * Kanaka in Narue no Sekai. A victim of Time Dilation, she's missed a couple of decades. After she realizes that everyone she knew is now completely different, she freaks out and tries to run off. Narue, determined to befriend her (technically older) sister, runs after her. Kanaka pulls a laser gun to try to frighten Narue off, and after a brief tussle, Kanaka completely unintentionally shoots her. Fortunately it was a non-lethal gun to begin with, but it's still enough to get Kanaka to thoroughly regret her actions. Well, that and some manly tears from Kazu.
 * In Gun X Sword, Michael, who has become a loyal minion of the Claw meets up with his sister, Wendy, one of the heroes. Wendy ends up shooting him in the arm to try and stop him, and he starts strangling her. Then, her pet turtle bites his finger and he snaps out of it, realizes what he's doing, and saves Wendy when the lair starts to collapse. While the series implies a Deadly Change-of-Heart for Michael and his lover Fasalina, who likewise snapped out of her loyalty to the Claw, supplemental materials go for Redemption Earns Life.
 * In the World Destruction manga, Morte finished her job in a city where the beastmen were eating humans. After berating Kyrie of doing something reckless, she blows up the entire city that they just saved for the fun of it. This action causes Kyrie to snap at her and he leaves the group which causes the group to split up (with Toppi and Naja going with him and Agan staying with Morte.) When he comes back, he throws the gun that she gave him to defend himself on the ground telling her that he doesn't need it anymore since he's not coming back. Cue, she snaps and attacks him proving Kyrie's point why he can't stay with her. Thankfully Toppi and Naja stopped her attack.
 * Happens in Nabari no Ou when Gau throws himself in front of Raikou's attack to stop him from killing his own little sister, Raimei. Complete with Raikou cradling Gau and crying.
 * In Elfen Lied,  While she's still murderous after that due to other unrelated events, quite a bit of guilt over said incident remains in her heart.
 * in Durarara!!. Everyone assumes that Izaya did this to Shinra in middle school for no reason whatsoever.
 * When Sakura sees Naruto's fox form for the first time, she tries to talk him out of it. Problem was that Naruto wasn't Naruto anymore; he was controlled by the Kyuubi, resulting in a horrifying 4-tailed state. To simply put it, he tail-slapped Sakura on the shoulder (badly) and tried to kill her while she was down.

Comic Books

 * Happens in The Spectacular Spider-Man (and probably other adaptations) while he's wearing the black suit.
 * Except in that long forgotten original comic storyline, where the suit didn't turn him evil at all ever, it just kept him up nights to act out more thrilling heroics. The evil only started when the symbiote got dumped and reacted poorly.
 * Sort of. They later retconned it into the symbiote's influence causing Spidey to act... well, pretty much like all the Iron Age comic heroes.

Film

 * Just like in the Animated Series, Spider Man 3 has  turn into a douchenozzle thanks to the alien symbiote turning him aggressive. He eventually goes on a date with Gwen Stacy (after getting dumped by Mary Jane), walks into the bar MJ is working at and proceeds to enter a hilarious song and dance meant to humiliate her. Finally the bouncer gets fed up and tries to throw him out. Peter easily deflects him, but also instinctively knocks MJ down when she tries to grab him. Peter suddenly realizes the symbiote is controlling him and tries to get rid of it.
 * Parodied in both Ace Ventura and The Naked Gun: The protagonist is trying to convince the others that the Reasonable Authority Figure is actually a villain in disguise and Crosses the Line Twice while trying to prove it.
 * Blade Trinity starts with the vampires arranging a Kick The Wrong Dog moment for Blade: The "vampire" that he was chasing simply had fake teeth.
 * At the end of Revenge of the Sith, Anakin
 * X Men First Class includes a dramatic confrontation where Magneto is deflecting bullets from a CIA agent trying to stop him from destroying the US and Soviet fleets. One of the bullets flies off and hits Charles in the spine. For a moment there's a look of pure horror and guilt on Eric's face, then he decides it was the CIA agent's fault (Xavier vocally disagrees and talks him down for the moment by playing on his guilt).

Literature

 * This is 's backstory in Harry Potter and the Deathly Hallows. He was dangerously close to joining with Grindelwald and becoming a Big Bad when his sister was accidently killed during an argument. At that point he came to his senses and instead became the Big Good that he is known as.
 * Also the story for . He was a loyal Voldemort supporter, proud to offer the use of his beloved House Elf...until he finds out that  . After he found out about that, he gave his life to try to bring Voldemort down.
 * And . When he found out the information he provided would lead directly to   death, he switched sides.
 * In Les Misérables, Jean Valjean steals from a little boy from force of habit after the bishop pardons him. While the child wasn't someone he knew, how monstrous the act was, especially since it came immediately after the bishop had pardoned him, was what prompted his Heel Realization and finalized his transformation into The Messiah.
 * In Gone, Caine's love/obsession for Diana was his one redeeming quality. But, in book four, . This upset the fangirls more than when he sicced coyotes on preschoolers.

Live Action TV

 * Angel does this (sorta) with Gunn and Wesley fighting over Fred, but when Gunn goes to hit Wesley, he accidentally hits Fred instead. Whoops!
 * Whilst elsewhere in the Buffyverse, Willow's downward spiral of magic addiction is brought to a halt when she crashes her car with Dawn in the passenger seat while under the influence. Her manipulative friend Amy, who has been encouraging her magic abuse, is hurt by Willow's decision to quit magic
 * In the Year Inside, Hour Outside series finale of Stargate SG-1, Daniel, having gotten fed up with what he thinks are Vala's intentionally shallow attempts at flirting and seducing him, lashes out with a nearly minute-long rant about her shortcomings that reduces Vala, who actually is genuinely attracted to him, to tears. It's especially shocking coming from Daniel of all people, but a close listen as his rant goes on reveals that he shifts from disparaging her actions to voicing his own insecurities and hesitancy about them having a relationship. And when a disturbed Daniel realizes both this and how badly he's hurt her, he quickly lets Vala know that he does return her feelings. They then decide to see if they can sustain a relationship, and you can guess what happens next. And considering that except for, they spend the next fifty years together with no problems before Sam reverses time, apparently they work out any remaining issues.
 * In the Saved by the Bell precursor show, Good Morning, Miss Bliss, one episode features Zack trying to join a club of popular jerks called the Rigmas. They tell him to start bullying his friends as part of his initiation. The biggest Kick the Morality Pet moment comes when he yells at Screech "Why would I want to be seen with a nothing like you?!" Thankfully, Zack later realized the error of his ways, and his friends forgave him. They together spend the last few minutes of the episode remarking on how stupid people often act in order to fit in with various groups. The episode ends with Zack symbolically dumping the bullies club membership jacket in the garbage while his friends give him the thumbs up.

Video Games

 * Tales of Symphonia: Dawn of the New World:
 * Experienced at least twice by Kratos, when he  Kratos isn't heroic enough to truly experience the moment of redemption, however.
 * Technically, by the Greeks' definition, he's more than heroic enough.
 * In Jedi Knight: Mysteries of the Sith,
 * Kingdom Hearts: Birth By Sleep has

Web Comics

 * Drowtales: Ariel was heading toward the Anti-Hero/Anti-Villain grey area, but after accidentally killing a slave she became more of an Emotionless Girl, and more recently more of a Plucky Girl type. Because of this she ended up sparing an enemy and avoided directly killing someone else, though given the Crapsack World of the setting both of those choices may come back to bite her.
 * Happens in the Webcomic Zap, with the protagonist learning to use his forgotten Psychic Powers to control people.
 * In the Secretary arc in Nature of Nature's Art,
 * Butterfly, aka has one of these moments when she lashes out at her slave Gunther because he worries about her mental state. She immediately regrets it. Though she'd already been established as a villain, this also serves to back up Gunther's theory that.

Weboriginal

 * It was this sort of moment, when she recklessly injures one of her teammates in a drunken stupor, that convinces the heroic Swallowtail of the Global Guardians PBEM Universe to seek help for her alcoholism.

Western Animation

 * Aang has a similar experience in Avatar: The Last Airbender. When Aang starts learning Firebending he proves his immense talent by turning a smoldering leaf into a ring of fire. Katara's hands get burned badly in the resulting blast, Sokka gets immensely pissed off at Aang for hurting his sister, and Aang, in shock, says he's sorry. Fortunately this is when Katara discovers she has (self) Healing Hands, but Aang ends up jumping to the conclusion that Firebending is strictly Bad Powers, Bad People, and resolves not to learn it. It would take two seasons for the cast to realize Firebending is not evil, and in fact life-affirming.
 * A Reformed but Rejected  wants to join Aang's True Companions. He goes to Toph, as she is the only one willing to consider letting him in, and then
 * There's also an event that took years to build up. Katara inadvertently ends up learning "blood bending", controlling the water in someone's very bloodstream to turn them into a puppet. Realizing the horrible possibilities of this kind of talent, especially when she's forced to use it to stop the twisted old lady who taught her the technique, she vows never to use it again... Until Zuko leads her on the path of the one that led the raids that took all the water benders from the Southern Tribe and killed her mother. After years of sorrow and mourning, cue one Roaring Rampage of Revenge, that ends with her using blood bending to almost make the man responsible kill himself.
 * Happened on an episode of Static Shock where a kid being remorselessly tormented by bullies brings a gun to school, instead of shooting the intended bully he misses and accidentally hits Richie instead, who he was just trying to be friends with awhile ago.
 * Technically the kid was just about to drop the gun and not shoot anyone anyway (Frieda and Richie talked him out of it). Richie was shot because just as the kid was about to give up the gun, the bully's idiot friends tackled him which made him accidentally squeeze the trigger.
 * Still holds true however because the kid suffers a massive My God, What Have I Done?.
 * A few episodes of Jimmy Two-Shoes had Heloise backing out of whatever evil she was doing because it was hurting Jimmy.
 * In an episode of Transformers Animated, an upgraded Prowl beats (clone) Starscream. Unfortunately there's a lot of collateral damage - including a torn down tree and broken bird eggs that he earlier made an effort to protect. Seeing these, Prowl realizes what a total asshole he's being.