History HoistByHisOwnPetard / Fanfiction

* ''FanFic/LovedAndLost'':
** [[spoiler:Jewelius tries to escape in his chariot, but fails because the wedding cake toppers he gave to Spike to torment him in exile are jammed into a wheel by Spike, ejecting Jewelius from the chariot]].
** [[spoiler:The same Changelings that Jewelius betrayed and, following their escape, foolishly ignored in favor of pursuing the heroes return the favor by [[EatenAlive eating Jewelius alive]]]].

[[AC:Manga/MyHeroAcademia]]

* In ''[[FanFic/NewLookSeries Ben's New Look]]'', Ben turns into Grey Matter to peep on a woman, but due to a rat in the vents, he ends up getting caught and Gwen decides to [[DraggedIntoDrag punish him by dressing him as a girl]].

* In ''FanFic/WinterWar'', the Barragan Fragment's power to age things to dust extends to its [[BloodyMurder blood]]. The fight is going badly when Isane guesses that it might be vulnerable to its own power. [[spoiler:At her suggestion, Ukitake and Soi Fong [[PoisonedWeapons put its blood on their swords]] before attacking again. Luckily for them, it works.]]

* The [[Fanfic/TheCalvinverse Calvinverse]] villain Rupert Chill usually disguises himself [[NamesTheSame as a human criminal of the same name]] whenever he'd arrive on Earth. ("The Five Calvins" implies this was intentional on alien!Rupert's part.) This comes back to bite him at the end of ''Fanfic/CalvinAndHobbesTheSeries''[='=] Season 5 premiere when [[spoiler:Calvin arranges for Rupert to be arrested by police while wearing his human disguise, and they dismiss his frantic attempts to tell them who he really is as insanity.]]

** Ultimately, Adrien/Chat Noir's [[EntitledToHaveYou entitled attitude towards Ladybug]] and staunch belief that he can [[DoggedNiceGuy harass her]] [[ThinksLikeARomanceNovel into giving in to his romantic advances]] is directly responsible for his downfall: [[spoiler:Miracle Queen disguises herself as Ladybug and offers a false confession. Despite her acting ''nothing'' like the real Ladybug, Chat Noir eagerly embraces her, and she successfully swipes the Black Cat ring and passes it on to Hawkmoth]].

** [[spoiler:[[FinalBoss The Queen]] is defeated during the FinalBattle when Uncle and Tohru invoke a SuperPowerMeltdown via her unbalanced chi, which she herself unbalanced by going OneWingedAngel.]

[[AC:''Literature/Worm'']]

* ''FanFic/LovedAndLost''
** [[spoiler: Jewelius tries to escape in his chariot, but fails because the wedding cake toppers he gave to Spike to torment him in exile are jammed into a wheel by Spike, ejecting Jewelius from the chariot]].
** [[spoiler: The same Changelings that Jewelius betrayed and, following their escape, foolishly ignored in favor of pursuing the heroes return the favor by [[EatenAlive eating Jewelius alive]]]].

** [[spoiler: Jewelius tries to escape in his chariot, but fails because the wedding cake toppers he used to torment Spike in exile are jammed into a wheel by Spike, ejecting Jewelius from the chariot]].
* Happens to a nameless griffon {{Mook}} in ''Fanfic/AceCombatTheEquestrianWar''. When he tries to bomb Stalliongrad, the pegasi manage to send the bomb he drops back at him, coupled with Derpy knocking the soldier toward the incoming bomb that went off.

* An excellent one from the oneshot ''[[https://www.fanfiction.net/s/11728619/1/Community-Service Community Service]]'': Voldemort's curse on the Hogwarts Defense Against the Dark Arts position really comes back to bite him, [[spoiler: when Dumbledore gets the EurekaMoment to allow all accused Death Eaters to get off with just community service. Specifically, ''two years mandated community service as DADA professor''. It's so successful that by the time Voldemort gets his body back, Wormtail is the ''only'' free Death Eater left.]]

* ''FanFic/AChampionInEarthBet'': Due to [[PhysicalGod the Avatar]]'s use of [[WindsOfDestinyChange fate manipulation]], the Simurgh ends up shooting herself with her own AntiMatter Tinker cannon. Which is all the opening the Avatar needs.

* In ''Fanfic/HellsisterTrilogy'', [[EvilSorcerer Mordru]] is more than powerful enough to wipe out the ComicBook/LegionOfSuperHeroes single-handedly. But he isn't satisfied with his already vasts levels of power so he travels to the actual Hell to make himself one with the essence of Evil. As attempting the merge, though, he put himself in a vulnerable position which gave Colossal Boy and ComicBook/{{Supergirl}} the opportunity to destroy him.
* In ''FanFic/ChildrenOfTheAtom'', The Super Mutants stockpile lime to smoke Rivet City's defenders out. Jason uses it on its creators.

* In ''Fanfic/TheChildOfAzkabanLonelyHarvest'', Voldemort and Quirrel bring Harry down into the Chamber of Secrets to be fed to the Basilisk. The Basilisk becomes enraged when he finds out that he was trying to feed him a parselmouth and that Quirrel himself was not a speaker, causing the enraged snake to devour Quirrel and become a protector to Harry.

* In the ''Franchise/HarryPotter''/''Franchise/ANightmareOnElmStreet'' crossover ''[[https://www.fanfiction.net/s/6868583/1/We-Are-Nothing We Are Nothing]]'', Snape's torment of Harry during their Occlumency 'lessons' causes so much damage to Harry's mental shields that he even breaks down the standard barriers everyone naturally possesses, creating an opportunity for Freddy Krueger to attack Hogwarts (albeit 'limited' to attacking anyone that Harry was already angry at in some way), with Snape being one of Krueger's first victims.

* In ''Fanfic/InfinityCrisis'', [[spoiler:Thor and Jane destroy Hela by attacking her with Stormbreaker and Mjolnir respectively; applies as Mjolnir was only a factor after Hela asked Thanos to recreate it for her, only for the hammer to 'reject' Hela due to the new worthiness enchantment while permitting Jane to wield it instead]].

* In ''[[https://www.fanfiction.net/s/12652330/1/eXtra-power-twin eXtra power twin]]'', after Fudge is voted out of office, he attempts to use the Imperius Curse on Scrimgeour to try and maintain some of his old authority, only to be automatically arrested and sent to Azkaban under the rules Fudge himself created about harsher sentences for those who attempt to attack the Minister of Magic.

* The [[Fanfic/TheCalvinverse Calvinverse]] villain Rupert Chill usually disguises himself [[NamesTheSame as a human criminal of the same name]] whenever he'd arrive on Earth. ("The Five Calvins" implies this was intentional on alien!Rupert's part.) This comes back to bite him at the end of ''Fanfic/CalvinAndHobbesTheSeries''[='=] Season 5 premiere when [[spoiler:Calvin arranges for Rupert to be arrested by police while wearing his human disguise, and they dismiss his frantic attempts to tell them who he really is as insanity.]]
* In ''FanFic/CrownsOfTheKingdom'', Maleficent falls victim to her own time-twisting spell due to ''Disney/SleepingBeauty'' not being made until four years after Disneyland was built.
* ''[[FanFic/JusticeLeagueOfEquestria The Princess of Themyscira]]'': [[BigBad Ares]] uses the [[ArtifactOfDoom Alicorn Amulet]] to open a portal to Tartarus and unleash the army of demons there in order to start a ForeverWar. When the Amulet is destroyed by Diana, the portal closes, and Ares' attempts at keeping it open only results in him getting sucked in and [[SealedEvilInACan trapped inside]].
* ''FanFic/ShadowsAwakening'':
** Turns out Tarakudo was imprisoned in the Shadow Realm because when he fled there to hide the mask made to seal him, his enemies just sealed him inside.
** [[spoiler:[[FinalBoss The Queen]] is defeated during the FinalBattle when Uncle and Tohru invoke a SuperPowerMeltdown via her unbalanced chi, which she herself unbalanced by going OneWingedAngel.]]
* In ''Fanfic/TheRiseOfDarthVulcan'', Big Boss, a dragon who obtained a massive hoard of gems by enslaving and abusing [[WesternAnimation/MyLittlePonyFriendshipIsMagic the Diamond Dogs]], is defeated when the title character uses his magic to form ''talons from the gems and metals of that very hoard'' , grabs him, and smashes him around repeatedly with them. And ''then'', Vulcan seals his mouth and nostrils shut with that treasure, causing the backfire that blows Big Boss' head off.
* [[AdvancingWallOfDoom The barrier]] in ''FanFic/TheConversionBureauTheOtherSideOfTheSpectrum'' does this to the Solar Empire ponies. While it's their main trump card (as they'd have been [[CurbstompBattle destroyed within days]] without it), it's made abundantly clear that the Barrier is, for lack of a better term, screwing them over. Since it destroys ''everything'' made by humans, like agriculture, infrastructure, buildings and the information on how to make those things, the TCB!ponies that are trying to colonize earth are forced to build everything from scratch (for example, they can't use human steel to make railroads since that gets destroyed) while also diverting their resources to the war. And thanks to the massive influx of newfoals, production of food (and virtually everything else) is at an all time low.
** Also in this TCB-verse, [[FanFic/TheConversionBureauNotAlone unicorns can turn human firearms against their shooters]]. So the PHL puts runes on their guns to make trying... painful.
** The Fujin missile which took down the Great Equestrian airship was able to do so by absorbing all the magic the TCB!ponies used in a failed attempt to stop it.
** TCB!Cloudchaser was hit by a poison that works like this -- it absorbs any magic in the area and kills the person or pony slowly. Thankfully, [[spoiler:Discord]] saves the day.
* [[Fanfic/DeliverUsFromEvilSeries Mortality]]: Most likely Moran gets killed by either Holmes or Watson after Moran tries to kill the former.
* In ''[[https://www.fanfiction.net/s/4354353/11/Harry-Potter-and-the-Wand-of-Uru Harry Potter and the Wand of Uru]]'', Flint's decision to have Wood injured badly enough to be removed from the game comes back to bite him when the replacement Keeper (Hermione) proves to be just as good and have better gear. Then she and Harry knock the opposing Seeker out of the game, making it impossible for Slytherin to not lose horribly since the only way to forfeit is for both captains to agree and Wood's still in the hospital wing.
* ''[[FanFic/RealityChecksNyxverse Alicornundrum]]'': [[BigBad Duke Blueblood]] is ultimately brought down when Nyx and her friends break into his home and find proof of his conspiracy against the throne, which is enough to horrify his son Prince Blueblood enough to help expose him. And all this only happened because the Duke spread photoshopped pictures of Nyx and her friends in lewd conditions as part of a petty smear campaign.
* ''[[Fanfic/HarryCrow Harry Crow]]'': Lucius Malfoy has 24 hours to withdraw the contents of his Gringotts vaults and anything left behind after then will be unreachable until his son becomes of age. Lucius is forced to miss the deadline because the Ministry has him under arrest and his wife can't do it for him because he never gave her permission to withdraw more than one hundred thousand Galleons per day. Later he gets another heaping dose when he does send his wife for those hundred thousand and she offers the money to Fudge to have the charges thrown out. Fudge promptly charges him with a bribery attempt and uses the cash as evidence.
* Subverted in ''Pyrrha(c) Victory''. One of the characters buys the equivalent of a love potion, intending to use it on the boy she likes...and eventually decides not to, reasoning that it would be wrong, and that it probably wouldn't work anyway. Despite this, [[RuleOfDrama she trips and accidentally doses herself with it]]. Moral of the story? Illegal substances are ''nobody'''s friend.
* ''[[https://www.fanfiction.net/s/4991314/1/Escape-from-the-Hokage-s-Hat Escape From the Hokage's Hat]]'': The Third Hokage's law about not telling anyone Naruto has the Kyuubi sealed in him. The parents of Konoha used it to turn him into a pariah. When Ino and Choji actually call their parents out on it and ask '''WHY''' they did it, the law prevents them from telling them the real reason and they end up looking like hateful pricks to an orphan.
* Shikamaru's match with Tenten goes this way in ''[[https://www.fanfiction.net/s/4573620/17/A-Drop-of-Poison A Drop of Poison]]''. Tenten immediately opens with her best technique which involves throwing massive numbers of weapons at her enemy then, if they dodge, pulling the weapons back with the wires attached to them and throwing again. Unfortunately for her, each of those wires casts a shadow, which leads directly to her own shadow. As Shikamaru explained, once that happened, he just needed to grab one of her weapons to make her bring one to her throat. It didn't help that because she leaps high into the air, she injures her legs upon landing since she can only mimic Shikamaru's movements.
* In ''{{FanFic/Vapors}}'' Deidara accidentally drops some of his explosive clay on himself when Aiko [[TeleportSpam closes the distance]] before he can blink. When he detonates ''all'' of his clay as a distraction to escape, the bit he'd dropped in his own lap blows his leg half-off.
* In ''[[https://www.fanfiction.net/s/10916587/8/A-Lion-and-His-Cub A Lion and His Cub]]'' Umbridge sets off an explosion in the Great Hall to try to convince a social worker that Harry's baby daughter would be safer in Ministry custody. When Harry is seriously injured while protecting her, the social worker ''approves'' his guardianship on the grounds that any good parent would "set aside their entire being for the child."
* ''FanFic/TheEquestrianWindMage'': At the end of Season 2, [[spoiler: when Demise is resurrected out of Ganondorf's body, he absorbs the Triforce of Power. However, the Elements of Harmony communicate with it, and turn it against him. The Elements and Triforce then work together to strike him down and render him DeaderThanDead.]]
* ''Fanfic/ThousandShinji'' has the next examples:
** In chapter 8, wanting to pay Rei back for ruining his latest "Annoy Asuka" ploy, Shinji nudges Asuka to take Rei to a shopping trip. Asuka bites the bait... but then she announces that he would carry their shopping bags.
--->The look on Shinji’s face would warm both Rei and Asuka for a long time as he was most definitely hoisted by his own petard.
** In chapter 14, Shinji realizes his planning and scheming has backfired completely.
--->Everything tied back to Shinji’s own scheming. He had been snared in a web of his own making. The phrase ‘hoisted by his own petard’ didn’t even begin to cover this sort of thing.
** Initially, Shinji wanted to get back at his father for abandoning him, but after a while he cast his planned revenge aside because he had found a real family. Then Gendo hurt his family to try to keep him under control. So Shinji ''hurt'' him back.
* In ''Fanfic/ChildrenOfAnElderGod'', [[Franchise/CthulhuMythos Nylarathotep]] tried to drive Asuka to despair. He was successful… to the point that she decided to burn everything down, starting with him.
* ''Fanfic/NeonGenesisEvangelionGenocide'': [[SmugSnake Kluge]] forms an alliance with [[spoiler:the Emerald Tablet, [[AIIsACrapshoot a rogue A.I.]]]] to help him and SEELE bring down NERV and cause Instrumentality. [[spoiler:After getting inside the Geofront with Kluge's help, the Tablet quickly concludes that [[YouHaveOutlivedYourUsefulness Kluge has outlived his usefulness and kills him]].]]
* ''[[https://www.fanfiction.net/s/11772125/1/Metroid-Kamen-Rider-Generations-Full-Series Metroid: Kamen Rider Generations]]'' provides us a frighteningly karmic example: [[spoiler:In [[https://www.fanfiction.net/s/11772125/118/Metroid-Kamen-Rider-Generations-Full-Series one chapter]], the [[SpotTheImpostor impostor]] [[Series/KamenRiderGhost Makoto Fukami]] shoots [[Series/KamenRiderGaim Mitsuzane]] from behind, not once, but '''[[https://www.fanfiction.net/s/11772125/120/Metroid-Kamen-Rider-Generations-Full-Series twice!]]''' Which is a callback from episode 26 of ''Kamen Rider Gaim'' where he shoots Kouta in the back.]]
-->'''Mitsuzane:''' [[LampshadeHanging It's very haunting to think that I once shot my friend in the back would eventually bite me in the ass.]]
* In ''[[http://draco664.fanficauthors.net/The_Widower_Maker/The_Widower_Maker/ The Widower Maker]]'', Harry uses a poorly-worded Marriage Law that forces half-bloods and Muggleborns to marry into Pureblood families (and be turned into all but slaves) to go scot free with killing all the women he is forced to marry and their families. And then uses ''that'' to ensure the law is repealed.
* In ''[[https://www.fanfiction.net/s/12566128/7/One-Flew-into-the-Cuckoos-Nest One Flew into the Cuckoos' Nest]]'' a jealous Quire tries to psychically lobotomize Harry, only to be turned into a drooling vegetable when Harry's own mutant ability reflects the attack with increased force.
* An excellent one from the oneshot ''[[https://www.fanfiction.net/s/11728619/1/Community-Service Community Service]]'': Voldemort's curse on the Hogwarts Defense Against the Dark Arts position really comes back to bite him, [[spoiler: when Dumbledore gets the EurekaMoment to allow all accused Death Eaters to get off with just community service. Specifically, ''two years mandated community service as DADA professor''. It's so successful that by the time Voldemort gets his body back, Wormtail is the ''only'' free Death Eater left.]]
* ''FanFic/ThePiecesLieWhereTheyFell'': [[spoiler: If Sunset Shimmer had waited for the dance, she could have gotten the crown easily. Instead, she has Snips and Snails steal it early, is caught in the act, and banned from the dance.]]
* In ''Fanfic/ANightInTheSculptureGarden'', [[spoiler:Irene Adler's plan to blackmail Molly Hooper into helping her backfires when Molly refuses and leaves her stuck as a statue.]]
* [[WesternAnimation/YoungJustice Psimon]] in ''[[https://www.fanfiction.net/s/12882198/3/We-Are-Legion-COMPLETE We Are Legion]]'' wipes Legion's memories entirely when they meet. Then the swarm of bugs Legion previously controlled go berserk and act on instinct, eating every living being in the camp, including Psimon himself.
* ''Fanfic/TheTickvsMyHeroAcademia'' had the battle between Eraserhead and the titular Tick be decided when Eraserhead bound Tick with his capture scarf, only to find it just means he made it easier for the invulnerable, superstrong crazy person to bash him around.
* In ''Fanfic/AmazingFantasy'', Rocker Racer Number One spends most of his villainous debut stealing from others and knocking out the opposition with his rocket-powered glove. Peter goads him into trying to use it on him, only for Peter to [[DeadlyDodging dodge at the last second]]. Number One's hand goes right through a wall behind Peter, leaving the upstart Villain's [[{{Fingore}} fingers horribly mangled.]]
* In ''WesternAnimation/{{Coco}}'' fanfic "Los Dos Ernestos", Ernesto's plan to kill Hector backfires because he mistakenly drinks from the poisoned glass and gives Hector the other one.
* ''Fanfic/{{Dial}}'': The algorithm that Arnim Zola created to track down anyone anywhere in the world for HYDRA's benefit is taken by Jury Rigg!Dial and repurposed into an algorithm to instead identify all HYDRA agents worldwide, allowing SHIELD to excise them precisely.
* ''Fanfic/{{Atonement}}'': Going to Brockton Bay leads to the deaths of everyone in the Nine except Burnscar and Mannequin and the end of the Slaughterhouse Nine as a threat.

* In ''Fanfic/InfinityCrisis'', [[spoiler:Thor and Jane destroy Hela by attacking her with Stormbreaker and Mjolnir respectively; applies as Mjolnir was only a factor after Hela asked Thanos to recreate it for her, only for the hammer to 'reject' Hela due to the new worthiness enchantment while permitting Jane to wield it instead]].

* ''Fanfic/AdviceAndTrust'': Ritsuko orders Shinji and Asuka to start spending more time with Rei, hoping that they help Rei to raise her synch scores. However the result is that Shinji and Asuka are learning things about Rei that neither Ritsuko nor Gendo want them knowing. Even worse, they have helped to Rei to become self-reliant and [[TrueCompanions have bonded with her]], and now she questions Gendo's will, trusts Shinji and Asuka more than she trusts him, and is willing to disobey his orders.
* Happens quite a bit in ''Fanfic/ArcVedProtagonists'':
** In “Coming Right Back”: Yugi was able to get Maximum use out of the spell card United We Stand because he was able to fill his entire field with Kuriboh tokens by the effect of kuritablet, which would only do so after Yuya destroyed a monster. Furthermore, because Yuya attacked one last time after that, Yugi had one open space to be filled with Dark Magician (the monster United We Stand was used with) thanks to Eternal Soul.
** In “Synchro Testing” Yusei would only be able to use the effect of his Synchro Uprising Trap if one of his Synchro monsters was destroyed that turn. Once Yugo used the effect of his Clear Wing Synchro Dragon on Junk Warrior, Yusei was able to play it to allow him to summon [[spoiler:Cosmic Blazar Dragon and win the duel.]]
** In “Shining Warrior, Dark Dragon”, Yuto played Magic Cylinder against Yuma, Which can negate an attack and inflict Damage to his opponent equal to the attack of the monster whom had it's attack negated. [[spoiler:As an added bonus, Yuma's monster actually had an effect that can take it off the field and dodge the trap card, but because Yuma powered it up with Stoic Challenge, he wasn't allowed to activate that effect, costing him the duel.]]
** In “Reluctant Choice”, Atticus using the effect of Red-Eyes Wyvern winds up helping Yuri more then it helped him, as without it, there wouldn't have been enough monsters on the field for Yuri to use as Fusion Material on his next turn.
** In “Dark Fusion”, Jaden's strategy to defeat Dennis heavily relied on the fact that Dennis's Pendulum cards were treated as spell cards while in the Pendulum Zone, both to power up his monsters and to get rid of one to stop it's effect from getting in the way. To make it even more of this trope, Jaden haven't even heard of Pendulum Summoning when the duel started or knew anything about Pendulum cards, Jaden only knew this info because Dennis made use of it on his previous turn.
* ''Fanfic/BatmanBeyondRevisited'': If the sadistic [[spoiler:Chainsaw]] isn’t burned to death by his own lighter, he’s killed by his WMD exploding. An explosion ''caused'' by his own lighter.
* One ''Series/StarTrekTheNextGeneration'' Fan Fic involving Q creating a second Jean Luc seems to be written [[{{Feghoot}} just to conclude with]] Data telling him "I'd say you were hoist by your own Picard."
* In ''Fanfic/TheLastSpartan'', Garrus kills Dr. Saleon [[spoiler:by locking him in a test chamber with a Flood infection form, something Saleon [[MoralEventHorizon had done to at least two other test subjects already]].]]
* In ''[[FanFic/NewLookSeries Ben's New Look]]'', Ben turns into Grey Matter to peep on a woman, but due to a rat in the vents, he ends up getting caught and Gwen decides to [[DraggedIntoDrag punish him by dressing him as a girl.]]
* In the Franchise/LyricalNanoha fanfic ''Fanfic/{{Infinity}}'', Lindy spends most of chapter 25 getting smacked around by Precia. Near the end, she reveals that she's been sealing Precia's magic the whole time, and electrocutes her with all the magic Precia used during the fight.
* Around the climax of ''FanFic/MyLittleAvengers'', this happens twice. First, when it appears as though the villains have won, [[BastardUnderstudy Trixie]] attempts to betray [[BigBad Loki]], only for him to turn her own magic back on her. [[spoiler:She survives and escapes, but is left horribly scarred.]] Later, during Loki and Thor's FinalBattle, [[spoiler:Loki pulls an ISurrenderSuckers, but Thor anticipates it and redirects Loki's own Soul Seal spell back on him, killing him]].
* In ''FanFic/WinterWar'', the Barragan Fragment's power to age things to dust extends to its [[BloodyMurder blood]]. The fight is going badly when Isane guesses that it might be vulnerable to its own power. [[spoiler:At her suggestion, Ukitake and Soi Fong [[PoisonedWeapons put its blood on their swords]] before attacking again. Luckily for them, it works.]]

* In ''WesternAnimation/AdventureTime'' fanfic, ''{{FanFic/Alex}}'', the titular antagonist provokes her opponent, Marceline, to spit at her coat, the same way she spitted at Princess Bubblegum's jacket at "What Was Missing". When she does it, the Witch uses a magic spell to put it at her gray top instead. Much after that, she has Finn and some wolves attacking her, the same way she did it to the former in "Go With Me".
* ''FanFic/MyLittleMagesTheNightmaresReturn'': The Diamond Dogs chase the girls into an Ursa Minor's cave, hoping they'll enrage it and it'll kill them. [[FriendToAllLivingThings Fluttershy]] manages to calm it down, and then sic it on the dogs.
** [[spoiler:[[TheDragon The Grand Master]] -- Pinkie's [[ArchnemesisDad father]] -- injects her with [[PsychoSerum Heart's Desire extract]] in order to bring out her dark side, so she'll join him. Unfortunately for him, said dark side is ''FanFic/{{Cupcakes}}'' levels of crazy, and she ends up nearly killing him before he retreats.]]
* ''FanFic/TheStarsWillAidTheirEscape'': [[spoiler:[[BigBad Herald]] ends up being defeated by several of his own actions throughout the story. [[KickTheDog Throwing the jar containing the CMC's souls over the waterfall]] not only allows them to be retrieved, but takes away the one thing that might have stopped Pinkie Pie from banishing him to outside of reality the same way he did it to the Princesses. That action in and of itself ends up costing him, as it allows them to fight him at full strength without having to worry about hurting their subjects as they would in Equestria, allowing them to begin winning the fight. This also buys the Mane Six enough time to kill the [[{{Mooks}} Dark Young]] and stop [[SealedEvilInACan Shub-Niggurath's summoning]].]]
* Happens to a nameless griffon {{Mook}} in ''Fanfic/AceCombatTheEquestrianWar''. When he tries to bomb Stalliongrad, the pegasi manage to send the bomb he drops back at him, coupled with Derpy knocking the soldier toward the incoming bomb that went off.
** The sequel mirrors this, with an Exile Pegasus trying to bomb Ponyville. This time, it's Sunburst getting the kill: he delivers a powerful kick to stun the bomber, and then catches the bomb and throws it at his foe (who's already falling out of the sky) to finish him off. There's even a brief cut to the bomber's perspective, ''[[OhCrap as he helplessly watches his own bomb coming at him!]]'' And to top it all off, there's Sunburst's PreMortemOneLiner:
--> '''Sunburst:''' "You forgot something!" *KABOOM!*
* In ''FanFic/NerveDamage'', after Shirou breaks the Heaven's Feel, Zouken forces Sakura to summon another servant besides Rider, even over her desperate desire not to fight Shirou. Cue her summoning an Assassin with just the power set to kill him off [[KilledOffForReal for real]] while leaving Sakura alive, who disdains the Grail and all who seek it as blasphemers, and who sees Zouken as just the type of monster she was designed to fight.
* ''FanFic/TimeLordsAndTerror'': [[WickedWitch Hydia]], who spent the whole story trying to release [[EldritchAbomination the S'Muz]], ends up [[EvilIsNotAToy being its first victim]]. [[spoiler:Also, the S’Muz itself is defeated when the ponies use their Elements of Harmony to absorb both the PKE it stole and the PKE that makes up its body and disperse it into Equestria.]]
* In ''[[FanFic/SovereignGFCOrigins Origins]]'', a ''Franchise/MassEffect''[=/=]''Franchise/StarWars''[[spoiler:[=/=]''[=Borderlands=]''[=/=]''[=Halo=]'']] MassiveMultiplayerCrossover, the [[StateSec Republic Intelligence Service]] tries to capture a [[spoiler:Force-sensitive Siren]]. However, their attack only makes the target stronger. Naturally, this target is not happy. [[CurbStompBattle Ass-kicking]] ensues.
** The [[spoiler:Force-sensitive Siren]] in general was this for those who made it. Through some LoopholeAbuse, these creators hoped to alleviate themselves of duties they found boring. Their creation saw right through their wordplay and decided to apply the [[DeadlyEuphemism consequences]] demanded by the law for those who sought to undermine it. Subverted in that creators eventually subdued their creation, at least until the events of ''Fractured'' set [[spoiler:Sarah]] free...
* ''FanFic/QueenOfAllOni'': Jade has [[EvilSorcerer Verde]] construct her an enchanted dog carrier to contain the Oni-masked Scruffy while speaking with the Bat-General; Tohru later uses this dog carrier to capture her (her minions save her, however). On top of that, Tohru reverse-engineers the magic involved to create sutra scrolls capable to restraining Oni.
** Later, when [[SmugSnake Lung]], Daolon Wong's former apprentice, captures Jade and tries to bind her and thus her Shadowkhan to his will [[spoiler:(which also counts as a CriticalResearchFailure, since Ikazuki's curse only allows her to summon Left and Right)]], his defenses are no match for her servants [[spoiler:and he is KilledOffForReal for torturing Jade and nearly killing her]]. [[AssholeVictim No tears were shed.]]
* During the fiance arc of ''FanFic/AGrowingAffection'', Hinata's grandfather Hyouta uses the Hyuga Clan's laws and traditions to try to break up Naruto and Hinata. When he thinks he has won, he says the wrong thing, and those same laws get turned on him. The result is Hyouta getting curb-stomped by Naruto, and then losing his power and status.
* Several villains in ''Fanfic/ChildrenOfTime''. Notably [[Series/DoctorWho Dalek Caan]] and [[spoiler:Colonel Marshall]] in "The Manhattan Conspiracy"... Caan wants to study a Time Lord's regenerative use of the Time Vortex? Give 'im the Time Vortex, then... And [[spoiler:Marshall]] is quite taken with the power of [[UsefulNotes/WorldWarII the atomic bomb]] -- the two Time Lords of the story plan accordingly.
* In the ''FanFic/PonyPOVSeries'', at the climax of the [[BadFuture Dark World Series]], [[spoiler:this is how Nightmare Eclipse/Paradox is ultimately defeated. Twilight copies her [[TimeMaster time magic]] and uses it to take advantage of how badly Paradox's GroundhogDayLoop plan has screwed up the timeline to [[GondorCallsForAid summon]] the [[CrisisCrossover G1, G2, G3, and (pre-Reign of Chaos) G4 Mane Casts]] in order to use their combined Elements of Harmony to finally defeat Paradox and her PsychoRangers.]]
** She also gets a double dose because [[spoiler:her plan of merging with every version of Nightmare Purgatory the moment of their birth results in ''all'' the alternate Nightmare Eclipses being linked to her, so her defeat ends up taking all of them with her.]]
** Earlier in Dark World, Rancor showed awareness of this trope and avoided it as best she could, refusing to use her Concept Killing Spear in battle with the Elements of Harmony, and later destroys it after using it to [[spoiler:steal Destruction's power from Discord]], so no one can ever use it against her. That said, her insistence on fighting Dark World!Spike backfires when he [[GeniusBruiser figures out]] how to get around her immunity to violence to actually hurt her.
** The Dazzlings run on ThePowerOfHate. For this reason, [[spoiler:when they are frozen in Windigo ice, their own power strengthens the ice and stops it from melting.]]

* The [[Fanfic/TheCalvinverse Calvinverse]] villain Rupert Chill usually disguises himself [[NamesTheSame as a human criminal of the same name]] whenever he'd arrive on Earth. ("The Five Calvins" implies this was intentional on alien!Rupert's part.) This comes back to bite him at the end of ''Fanfic/CalvinAndHobbesTheSeries''[='=] Season 5 premiere when [[spoiler:Calvin arranges for Rupert to be arrested by police while wearing his human disguise, and they dismiss his frantic attempts to tell them who he really is as insanity.]]
* In ''FanFic/CrownsOfTheKingdom'', Maleficent falls victim to her own time-twisting spell due to ''Disney/SleepingBeauty'' not being made until four years after Disneyland was built.
* ''[[FanFic/JusticeLeagueOfEquestria The Princess of Themyscira]]'': [[BigBad Ares]] uses the [[ArtifactOfDoom Alicorn Amulet]] to open a portal to Tartarus and unleash the army of demons there in order to start a ForeverWar. When the Amulet is destroyed by Diana, the portal closes, and Ares' attempts at keeping it open only results in him getting sucked in and [[SealedEvilInACan trapped inside]].
* ''FanFic/ShadowsAwakening'':
** Turns out Tarakudo was imprisoned in the Shadow Realm because when he fled there to hide the mask made to seal him, his enemies just sealed him inside.
** [[spoiler:[[FinalBoss The Queen]] is defeated during the FinalBattle when Uncle and Tohru invoke a SuperPowerMeltdown via her unbalanced chi, which she herself unbalanced by going OneWingedAngel.]]
* In ''Fanfic/TheRiseOfDarthVulcan'', Big Boss, a dragon who obtained a massive hoard of gems by enslaving and abusing [[WesternAnimation/MyLittlePonyFriendshipIsMagic the Diamond Dogs]], is defeated when the title character uses his magic to form ''talons from the gems and metals of that very hoard'' , grabs him, and smashes him around repeatedly with them. And ''then'', Vulcan seals his mouth and nostrils shut with that treasure, causing the backfire that blows Big Boss' head off.
* [[AdvancingWallOfDoom The barrier]] in ''FanFic/TheConversionBureauTheOtherSideOfTheSpectrum'' does this to the Solar Empire ponies. While it's their main trump card (as they'd have been [[CurbstompBattle destroyed within days]] without it), it's made abundantly clear that the Barrier is, for lack of a better term, screwing them over. Since it destroys ''everything'' made by humans, like agriculture, infrastructure, buildings and the information on how to make those things, the TCB!ponies that are trying to colonize earth are forced to build everything from scratch (for example, they can't use human steel to make railroads since that gets destroyed) while also diverting their resources to the war. And thanks to the massive influx of newfoals, production of food (and virtually everything else) is at an all time low.
** Also in this TCB-verse, [[FanFic/TheConversionBureauNotAlone unicorns can turn human firearms against their shooters]]. So the PHL puts runes on their guns to make trying... painful.
** The Fujin missile which took down the Great Equestrian airship was able to do so by absorbing all the magic the TCB!ponies used in a failed attempt to stop it.
** TCB!Cloudchaser was hit by a poison that works like this -- it absorbs any magic in the area and kills the person or pony slowly. Thankfully, [[spoiler:Discord]] saves the day.
* [[Fanfic/DeliverUsFromEvilSeries Mortality]]: Most likely Moran gets killed by either Holmes or Watson after Moran tries to kill the former.
* In ''[[https://www.fanfiction.net/s/4354353/11/Harry-Potter-and-the-Wand-of-Uru Harry Potter and the Wand of Uru]]'', Flint's decision to have Wood injured badly enough to be removed from the game comes back to bite him when the replacement Keeper (Hermione) proves to be just as good and have better gear. Then she and Harry knock the opposing Seeker out of the game, making it impossible for Slytherin to not lose horribly since the only way to forfeit is for both captains to agree and Wood's still in the hospital wing.
* ''[[FanFic/RealityChecksNyxverse Alicornundrum]]'': [[BigBad Duke Blueblood]] is ultimately brought down when Nyx and her friends break into his home and find proof of his conspiracy against the throne, which is enough to horrify his son Prince Blueblood enough to help expose him. And all this only happened because the Duke spread photoshopped pictures of Nyx and her friends in lewd conditions as part of a petty smear campaign.
* ''[[Fanfic/HarryCrow Harry Crow]]'': Lucius Malfoy has 24 hours to withdraw the contents of his Gringotts vaults and anything left behind after then will be unreachable until his son becomes of age. Lucius is forced to miss the deadline because the Ministry has him under arrest and his wife can't do it for him because he never gave her permission to withdraw more than one hundred thousand Galleons per day. Later he gets another heaping dose when he does send his wife for those hundred thousand and she offers the money to Fudge to have the charges thrown out. Fudge promptly charges him with a bribery attempt and uses the cash as evidence.
* Subverted in ''Pyrrha(c) Victory''. One of the characters buys the equivalent of a love potion, intending to use it on the boy she likes...and eventually decides not to, reasoning that it would be wrong, and that it probably wouldn't work anyway. Despite this, [[RuleOfDrama she trips and accidentally doses herself with it]]. Moral of the story? Illegal substances are ''nobody'''s friend.
* ''[[https://www.fanfiction.net/s/4991314/1/Escape-from-the-Hokage-s-Hat Escape From the Hokage's Hat]]'': The Third Hokage's law about not telling anyone Naruto has the Kyuubi sealed in him. The parents of Konoha used it to turn him into a pariah. When Ino and Choji actually call their parents out on it and ask '''WHY''' they did it, the law prevents them from telling them the real reason and they end up looking like hateful pricks to an orphan.
* Shikamaru's match with Tenten goes this way in ''[[https://www.fanfiction.net/s/4573620/17/A-Drop-of-Poison A Drop of Poison]]''. Tenten immediately opens with her best technique which involves throwing massive numbers of weapons at her enemy then, if they dodge, pulling the weapons back with the wires attached to them and throwing again. Unfortunately for her, each of those wires casts a shadow, which leads directly to her own shadow. As Shikamaru explained, once that happened, he just needed to grab one of her weapons to make her bring one to her throat. It didn't help that because she leaps high into the air, she injures her legs upon landing since she can only mimic Shikamaru's movements.
* In ''{{FanFic/Vapors}}'' Deidara accidentally drops some of his explosive clay on himself when Aiko [[TeleportSpam closes the distance]] before he can blink. When he detonates ''all'' of his clay as a distraction to escape, the bit he'd dropped in his own lap blows his leg half-off.
* In ''[[https://www.fanfiction.net/s/10916587/8/A-Lion-and-His-Cub A Lion and His Cub]]'' Umbridge sets off an explosion in the Great Hall to try to convince a social worker that Harry's baby daughter would be safer in Ministry custody. When Harry is seriously injured while protecting her, the social worker ''approves'' his guardianship on the grounds that any good parent would "set aside their entire being for the child."
* ''FanFic/TheEquestrianWindMage'': At the end of Season 2, [[spoiler: when Demise is resurrected out of Ganondorf's body, he absorbs the Triforce of Power. However, the Elements of Harmony communicate with it, and turn it against him. The Elements and Triforce then work together to strike him down and render him DeaderThanDead.]]
* ''Fanfic/ThousandShinji'' has the next examples:
** In chapter 8, wanting to pay Rei back for ruining his latest "Annoy Asuka" ploy, Shinji nudges Asuka to take Rei to a shopping trip. Asuka bites the bait... but then she announces that he would carry their shopping bags.
--->The look on Shinji’s face would warm both Rei and Asuka for a long time as he was most definitely hoisted by his own petard.
** In chapter 14, Shinji realizes his planning and scheming has backfired completely.
--->Everything tied back to Shinji’s own scheming. He had been snared in a web of his own making. The phrase ‘hoisted by his own petard’ didn’t even begin to cover this sort of thing.
** Initially, Shinji wanted to get back at his father for abandoning him, but after a while he cast his planned revenge aside because he had found a real family. Then Gendo hurt his family to try to keep him under control. So Shinji ''hurt'' him back.
* In ''Fanfic/ChildrenOfAnElderGod'', [[Franchise/CthulhuMythos Nylarathotep]] tried to drive Asuka to despair. He was successful… to the point that she decided to burn everything down, starting with him.
* ''Fanfic/NeonGenesisEvangelionGenocide'': [[SmugSnake Kluge]] forms an alliance with [[spoiler:the Emerald Tablet, [[AIIsACrapshoot a rogue A.I.]]]] to help him and SEELE bring down NERV and cause Instrumentality. [[spoiler:After getting inside the Geofront with Kluge's help, the Tablet quickly concludes that [[YouHaveOutlivedYourUsefulness Kluge has outlived his usefulness and kills him]].]]
* ''[[https://www.fanfiction.net/s/11772125/1/Metroid-Kamen-Rider-Generations-Full-Series Metroid: Kamen Rider Generations]]'' provides us a frighteningly karmic example: [[spoiler:In [[https://www.fanfiction.net/s/11772125/118/Metroid-Kamen-Rider-Generations-Full-Series one chapter]], the [[SpotTheImpostor impostor]] [[Series/KamenRiderGhost Makoto Fukami]] shoots [[Series/KamenRiderGaim Mitsuzane]] from behind, not once, but '''[[https://www.fanfiction.net/s/11772125/120/Metroid-Kamen-Rider-Generations-Full-Series twice!]]''' Which is a callback from episode 26 of ''Kamen Rider Gaim'' where he shoots Kouta in the back.]]
-->'''Mitsuzane:''' [[LampshadeHanging It's very haunting to think that I once shot my friend in the back would eventually bite me in the ass.]]
* In ''[[http://draco664.fanficauthors.net/The_Widower_Maker/The_Widower_Maker/ The Widower Maker]]'', Harry uses a poorly-worded Marriage Law that forces half-bloods and Muggleborns to marry into Pureblood families (and be turned into all but slaves) to go scot free with killing all the women he is forced to marry and their families. And then uses ''that'' to ensure the law is repealed.
* In ''[[https://www.fanfiction.net/s/12566128/7/One-Flew-into-the-Cuckoos-Nest One Flew into the Cuckoos' Nest]]'' a jealous Quire tries to psychically lobotomize Harry, only to be turned into a drooling vegetable when Harry's own mutant ability reflects the attack with increased force.
* An excellent one from the oneshot ''[[https://www.fanfiction.net/s/11728619/1/Community-Service Community Service]]'': Voldemort's curse on the Hogwarts Defense Against the Dark Arts position really comes back to bite him, [[spoiler: when Dumbledore gets the EurekaMoment to allow all accused Death Eaters to get off with just community service. Specifically, ''two years mandated community service as DADA professor''. It's so successful that by the time Voldemort gets his body back, Wormtail is the ''only'' free Death Eater left.]]
* ''FanFic/ThePiecesLieWhereTheyFell'': [[spoiler: If Sunset Shimmer had waited for the dance, she could have gotten the crown easily. Instead, she has Snips and Snails steal it early, is caught in the act, and banned from the dance.]]
* In ''Fanfic/ANightInTheSculptureGarden'', [[spoiler:Irene Adler's plan to blackmail Molly Hooper into helping her backfires when Molly refuses and leaves her stuck as a statue.]]
* [[WesternAnimation/YoungJustice Psimon]] in ''[[https://www.fanfiction.net/s/12882198/3/We-Are-Legion-COMPLETE We Are Legion]]'' wipes Legion's memories entirely when they meet. Then the swarm of bugs Legion previously controlled go berserk and act on instinct, eating every living being in the camp, including Psimon himself.
* ''Fanfic/TheTickvsMyHeroAcademia'' had the battle between Eraserhead and the titular Tick be decided when Eraserhead bound Tick with his capture scarf, only to find it just means he made it easier for the invulnerable, superstrong crazy person to bash him around.
* In ''Fanfic/AmazingFantasy'', Rocker Racer Number One spends most of his villainous debut stealing from others and knocking out the opposition with his rocket-powered glove. Peter goads him into trying to use it on him, only for Peter to [[DeadlyDodging dodge at the last second]]. Number One's hand goes right through a wall behind Peter, leaving the upstart Villain's [[{{Fingore}} fingers horribly mangled.]]
* In ''WesternAnimation/{{Coco}}'' fanfic "Los Dos Ernestos", Ernesto's plan to kill Hector backfires because he mistakenly drinks from the poisoned glass and gives Hector the other one.
* ''Fanfic/{{Dial}}'': The algorithm that Arnim Zola created to track down anyone anywhere in the world for HYDRA's benefit is taken by Jury Rigg!Dial and repurposed into an algorithm to instead identify all HYDRA agents worldwide, allowing SHIELD to excise them precisely.
* ''Fanfic/{{Atonement}}'': Going to Brockton Bay leads to the deaths of everyone in the Nine except Burnscar and Mannequin and the end of the Slaughterhouse Nine as a threat.
* ''FanFic/AChampionInEarthBet'': Due to [[PhysicalGod the Avatar]]'s use of [[WindsOfDestinyChange fate manipulation]], the Simurgh ends up shooting herself with her own AntiMatter Tinker cannon. Which is all the opening the Avatar needs.
* In ''Fanfic/HellsisterTrilogy'', [[EvilSorcerer Mordru]] is more than powerful enough to wipe out the ComicBook/LegionOfSuperHeroes single-handedly. But he isn't satisfied with his already vasts levels of power so he travels to the actual Hell to make himself one with the essence of Evil. As attempting the merge, though, he put himself in a vulnerable position which gave Colossal Boy and ComicBook/{{Supergirl}} the opportunity to destroy him.
* In ''FanFic/ChildrenOfTheAtom'', The Super Mutants stockpile lime to smoke Rivet City's defenders out. Jason uses it on its creators.
* In ''Fanfic/TheChildOfAzkabanLonelyHarvest'', Voldemort and Quirrel bring Harry down into the Chamber of Secrets to be fed to the Basilisk. The Basilisk becomes enraged when he finds out that he was trying to feed him a parselmouth and that Quirrel himself was not a speaker, causing the enraged snake to devour Quirrel and become a protector to Harry.
* In the ''Franchise/HarryPotter''/''Franchise/ANightmareOnElmStreet'' crossover ''[[https://www.fanfiction.net/s/6868583/1/We-Are-Nothing We Are Nothing]]'', Snape's torment of Harry during their Occlumency 'lessons' causes so much damage to Harry's mental shields that he even breaks down the standard barriers everyone naturally possesses, creating an opportunity for Freddy Krueger to attack Hogwarts (albeit 'limited' to attacking anyone that Harry was already angry at in some way), with Snape being one of Krueger's first victims.
* In ''Fanfic/InfinityCrisis'', [[spoiler:Thor and Jane destroy Hela by attacking her with Stormbreaker and Mjolnir respectively; applies as Mjolnir was only a factor after Hela asked Thanos to recreate it for her, only for the hammer to 'reject' Hela due to the new worthiness enchantment while permitting Jane to wield it instead]].
* In ''[[https://www.fanfiction.net/s/12652330/1/eXtra-power-twin eXtra power twin]]'', after Fudge is voted out of office, he attempts to use the Imperius Curse on Scrimgeour to try and maintain some of his old authority, only to be automatically arrested and sent to Azkaban under the rules Fudge himself created about harsher sentences for those who attempt to attack the Minister of Magic.

* In ''Fanfic/InfiniteCrisis'', [[spoiler:Thor and Jane destroy Hela by attacking her with Stormbreaker and Mjolnir respectively; applies as Mjolnir was only a factor after Hela asked Thanos to recreate it for her, only for the hammer to 'reject' Hela due to the new worthiness enchantment while permitting Jane to wield it instead]].

* In ''[[https://www.fanfiction.net/s/12652330/50/eXtra-power-twin eXtra power twin]]'', after Fudge is voted out of office, he attempts to use the Imperius Curse on Scrimgeour to try and maintain some of his old authority, only to be automatically arrested and sent to Azkaban under the rules Fudge himself created about harsher sentences for those who attempt to attack the Minister of Magic.

* ''FanFic/AChampionInEarthBet'': In a brutal moment of bad luck, the Simurgh ends up shooting herself with her own Anti Matter Tinker cannon. Which is all the opening the Avatar needs.

* In ''[[FanFic/SovereignGFCOrigins Origins]]'', a ''MassEffect''[=/=]''StarWars''[[spoiler:[=/=]''[=Borderlands=]''[=/=]''[=Halo=]'']] MassiveMultiplayerCrossover, the [[StateSec Republic Intelligence Service]] tries to capture a [[spoiler:Force-sensitive Siren]]. However, their attack only makes the target stronger. Naturally, this target is not happy. [[CurbStompBattle Ass-kicking]] ensues.

* In ''Fanfic/AmazingFantasy'', Rocker Racer Number One spends most of his villainous debut stealing form others and knocking out the opposition with his rocket-powered glove. Peter goads him into trying to use it on him, only for Peter to [[DeadlyDodging dodge at the last second]]. Number One's hand goes right through a wall behind Peter, leaving the upstart Villain's [[{{Fingore}} fingers horribly mangled.]]

* In the ''Franchise/HarryPotter''/''Franchise/ANightmareOnElmStreet'' crossover ''[[https://www.fanfiction.net/s/6868583/1/We-Are-Nothing We Are Nothing]]'', Umbridge's attempt to question Harry about the recent murders in Hogwarts using Veritaserum backfires horribly against her; not only can Harry honestly answer that he didn't kill anyone, but he also uses the opportunity to confirm that Voldemort is alive, with Umbridge giving the investigating aurors sufficient evidence to arrest her when she nearly poisons Harry with an overdose of the potion trying to make him stop 'lying'.

* During the fiance arc of FanFic/AGrowingAffection, Hinata's grandfather Hyouta uses the Hyuga Clan's laws and traditions to try to break up Naruto and Hinata. When he thinks he has won, he says the wrong thing, and those same laws get turned on him. The result is Hyouta getting curb-stomped by Naruto, and then losing his power and status.