* 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 MagicalGirlLyricalNanoha 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.]]
* ''FanFic/TheFallOfTheFireEmpire'': [[spoiler:Azula is ultimately only defeated because one of her own [[UndyingLoyalty undyingly loyal]] Chosen is tricked into killing her.]]
* 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:For all his GenreSavvy, [[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 SíMuz 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.]]
* ''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 [[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 [[BiggerBad 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.
* In ''FanFic/SevenLittleKillers'', [[spoiler:Canada]] has been dumping the bodies of the people [[spoiler:America]] allows to be killed in the river. Unfortunately for him, [[spoiler:he turns out to be one of the people America decides to let die]]. Guess where he winds up drowning?
* 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.
* ''[[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 hid 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 the ''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.
* 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.
* 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.
* In ''FanFic/OriginStory'', Alex Harris stops TheJuggernaut (whose power essentially boils down to the phrase "once he's in motion, he cannot be stopped) not by trying to directly stand before him, as most other superheroes have attempted, but by slamming him at full force from the back, causing him to lose his footing, fall, and roll uncontrollably for several blocks. Once he's knocked off his feet and ''not'' moving, Alex (who is physically stronger than TheJuggernaut is, and can fly) finds the villain easily to take care of. TheJuggernaut is left perplexed why nobody who has ever fought him has thought of doing that before.