History HoistByHisOwnPetard / WebOriginal

** While the members of Creator/AchievementHunter were playing a game of ''Uno'' on the UsefulNotes/XBoxOne, Creator/GavinFree suggests that they play the game to 500 points, the maximum. [[LetsPlay/UnoTheMovie This is the result.]]

* LetsPlay/PartyCrashers:

* ''LetsPlay/{{Dream}}:'' At the end of the first Death Swap, George goes to the Nether, intending to jump into a lava lake at the last second before the next swap and leave Dream to burn. Dream, however, has an enchanted golden apple, which he uses to survive the lava. He then spends five minutes sitting in the lava, intending to just have George die in the very lava he tried to kill Dream with. [[LampshadeHanging Dream even lampshades it]].

* Happens to Big Mike, games master of all WebVideo/D20Live games, a ''lot''.

-->'''Dream''': I'm just gonna throw you back into your own lava!

** In "[[https://www.youtube.com/watch?v=5nj3RLnNqwY Mario Party but the Magic Conch COMMANDS US]]", Nick asks if he can ''not'' get a Star during the last 3 turns of the game, [[NoMeansYes banking on the Conch telling him "no"]]. He ends up having to skip ''2'' Stars due to the Conch replying "yes" to ''every'' question he asks. It isn't until his very last attempt on the final turn of the game when the Magic Conch finally gives him the "no" he's been looking for, in spite of insistence from the others that he would have gotten the Star much more easily had he just asked normally.
** Early on in their game on ''VideoGame/MarioParty3''[='=]s [[https://www.youtube.com/watch?v=Eay58RkhQmA Spiny Desert]], Brent receives the Wacky Watch from Toad, a rare item that causes the game to immediately go to the last 5 turns. Brent ultimately decides to use it on turn 20 (despite having a guaranteed victory) to add 5 more turns to the game just to show off the item. This ends up costing him the game as Nick manages to overtake him in Stars during those extra 5 turns.

** In "[[https://www.youtube.com/watch?v=5nj3RLnNqwY Mario Party but the Magic Conch COMMANDS US]]", Nick for some reason decides to ask if he can ''not'' get a Star during the last 3 turns of the game, [[NoMeansYes banking on the Conch telling him "no"]]. He ends up having to skip ''2'' Stars due to the Conch replying "yes" to ''every'' question he asks. It isn't until his very last attempt on the final turn of the game when the Magic Conch finally gives him the "no" he's been looking for, in spite of insistence from the others that he would have gotten the Star much more easily had he just asked normally.
** Early on during their game on ''Mario Party 3''[='=]s [[https://www.youtube.com/watch?v=Eay58RkhQmA Spiny Desert]], Brent receives the Wacky Watch from Toad, a rare item that causes the game to immediately go to the last 5 turns. Brent ultimately decides to use it on turn 20 (despite having a guaranteed victory) to add 5 more turns to the game just to show off the item. This ends up costing him the game as Nick manages to overtake him in Stars during those extra 5 turns.

!!Often a DeathTrope, so expect to see unmarked spoilers ahead.

** Taako possesses a weapon called the Umbra Staff, a wand disguised as an umbrella which eats the magical essence of a defeated enemy spellcaster. This usually just involves the staff eating the target's wand. [[spoiler: Lup, Taako's sister and the creator of the staff, is a lich, a creature formed when a magic user fuses their soul with their magical essence, leaving them immortal beings made of raw arcane energy. But since the staff eats arcane energy, when she's killed with it in her possession, it devours her lich-form and traps her inside.]]

** In an attempt to conquer the End-dimension, Raccoon Lizzie tricks a bunch of people into jumping into the End-portal with her, by dropping them all down a chute into the portal. [[spoiler:However, she [[DidntThinkThisThrough didn't take into account]] the fact that nine people, including one Giant, wouldn't all fit on the tiny 3×3 spawn platform, and she winds up getting pushed into the Void, leading to the server's first death.]]
** In an attempt to create an "inescapable" escape room to trap several unsuspecting victims inside, Enigma Lizzie creates a "boat race" for them while pretending to be a pirate captain, and while her trap succeeds briefly, [[spoiler:the moment she phases through the walls of the room with her Enigma powers, a shoal of Guardians ambush and kill her.]]

* ''WebAnimation/AttackOnMika'': Gozumi runs off when Iketa catches [[https://www.youtube.com/watch?v=E9zoEtQiWdk her squeezing Saki's broken leg]] and shows her the CCTV recordings of her abuse. However, as Gozumi threatened to ruin them both, [[spoiler:she slipped down the stairs and broke her legs]].

* ''WebVideo/CriticalRole'': [[spoiler:In the Mighty Nein's first fight against Lorenzo, Molly attempted to use his [[CastFromHitPoints Blood Maledict]] to give Lorenzo disadvantage, but because of an unluckily high damage roll, accidentally knocked himself out in the process. It then looped around to Lorenzo's turn, who took the opportunity to stab Molly through the chest, killing him instantly.]]

* In ''WebAnimation/DeathBattle'', this has happened several times
** [[spoiler: [[VideoGame/DigDug Taizo Hori]]]] kills [[spoiler: [[{{VideoGame/Bomberman}} White Bomberman]]]] with his own bomb.
** Similarly, [[spoiler: [[WesternAnimation/MyLittlePonyFriendshipIsMagic Rainbow Dash]]]] defeats [[spoiler: [[Franchise/TransformersGeneration1 Starscream]]]] by tricking his own guided missiles into hitting him instead of her.
** A double dose in [[spoiler: [[Franchise/MegaMan Dr. Wily]] vs. [[Franchise/SonicTheHedgehog Dr. Eggman]]]]. [[spoiler: Eggman]] uses [[spoiler: Metal Sonic]] against his opponent, and [[spoiler: Wily]] unleashes the [[spoiler: Roboenza virus]] as a counter, which leads to [[spoiler: Metal Sonic going on an indiscriminate rampage]] and both their demises.
** [[spoiler:[[WesternAnimation/AvatarTheLastAirbender Toph]]]] crushes [[spoiler:[[Manga/{{Naruto}} Gaara]]]] to death with [[spoiler:his own sand armor.]]
** [[spoiler: [[ComicBook/TheLifeAndTimesOfScroogeMcDuck Scrooge McDuck]]]] kills [[spoiler: VideoGame/ShovelKnight]] with his own [[spoiler: shovel]].
** While it did take some set up, [[spoiler: [[Franchise/{{Kirby}} King Dedede]]]] kills [[spoiler:[[Franchise/SuperMarioBros Wario]]]] via [[spoiler:Wario's own Waft by [[AssShove plugging a Gordo up his butt]].]]
** [[spoiler:[[WebAnimation/{{RWBY}} Blake]]]] kills [[spoiler:[[Manga/AttackOnTitan Mikasa]]]] with [[spoiler:Mikasa's own Thunder Spear.]]
** [[spoiler:[[ComicBook/SonicTheHedgehogArchieComics Silver the Hedgehog]]]] does this ''constantly'' against [[spoiler:[[VideoGame/DragonBallXenoverse Xeno Trunks]]]] during their fight via [[CatchAndReturn repeatedly redirecting his attacks back]]. [[spoiler:This includes the killing blow, where Silver warps Trunk's [[SpellBlade Keysword]] behind his foe and lets him get impaled and temporally erased by his own intended finisher.]] The hosts note in the aftermath the former's ability to effectively invoke this at will was a major advantage in his favor.
** [[Series/DoctorWho The Doctor]] vs [[WesternAnimation/RickAndMorty Rick Sanchez]]: [[spoiler:while the Doctor is the one who introduces the [[RetGone D-Mat Gun]] into the fight, Rick is ultimately the one who fires it, and it's Rick's portals that allow the Doctor to redirect the shot and erase Rick from time for the victory.]]
** The Spin-off, Death Race, has two linked ones happen in quick succession in the final episode: [[spoiler:[[Franchise/SuperMarioBros Mario]] offs himself by accident with a Bob-omb]], which in turn [[spoiler:causes [[Franchise/SonicTheHedgehog Sonic]] to inadvertently off himself with his own Blue Shell, as it locked onto him when Mario died]]. Notably, these two are the ONLY Death Race combatants to, accidentally or otherwise, kill themselves during a race (Optimus Prime killed himself at the end of episode 2, but that was AFTER he had won the race).

* In ''Literature/FearLoathingAndGumboOnTheCampaignTrailSeventyTwo'', this happens to [[spoiler:[[AxeCrazy President Rumsfield]] when he is accused of being mentally unfit, having a "nervous breakdown", during his impeachment proceedings and is dragged away to one of the same mental hospitals that he himself locked many of his political opponents in]].

* ''WebVideo/MarbleHornets'' has the BigBad of the series, Alex, [[spoiler:being dragged off by the Operator after being defeated by Tim, just like how he sacrificed people to the Operator to save himself.]]

** Lucks had spent nearly two years [[spoiler: covering up the fate of Lucinia, even willing to threaten and lie to the media and even his own Meta Runners just to keep it secret. Not only do his misdeeds eventually get exposed, but he ends up getting killed when Dr. Sheridan, the man who Lucks allowed to run his dangerous experiments unchecked and start this whole dilemma in the first place, takes control of Masa's Meta Runner arm and shoots him point blank in the head. And for extra irony, Sheridan uses the exact same gun Lucks did to shoot off Masa's original arm.]]
** [[spoiler:Dr. Sheridan himself is subject to this too. It's stated that Sheridan had been anonymously selling Meta Bugs, computer chips capable of causing technology to malfunction, with him using one to make Masa kill Lucks. Among the people he sold the Meta Bugs to was Masa, who used one to cheat in a competition against Marco so he could get a replacement Meta Runner arm. In the GrandFinale, Marco gets hold of Sheridan and uses a box of Meta Bugs to [[BodyHorror electrocute Sheridan to death until all that remains is his charred corpse.]]]]

** [[spoiler:Henry Ford flees the UASR to Germany, where he becomes Hitler's chief armament minister. His arrogance and belief in Nazi superiority leads him to put his marque on everything his company builds, including weapons produced with slave labour. When Germany is defeated, [[ImplausibleDeniability he's unable to deny his very obvious role in Nazi atrocities]], and gets no mercy from the UASR.]]

-->'''Dslyecxi:''' ''[After seeing that the helicopter he shot down is about to crash right next to him]'' Oooh boy. I regret that. ''[Teammates scream in fear, the helicopter crashes and [[StuffBlowingUp blows up]], killing or wounding multiple people including Dslyecxi]''
* Creator/TomScott's story, ''[[https://www.youtube.com/watch?v=y4GB_NDU43Q Single Point of Failure]]'', is set off when one of Google's five trusted users sabotages their password code to, effectively, let anyone into any Google account without a password. Most of the story focuses on the devastating effects this has, but [[spoiler:at the end, almost as an afterthought, he mentions that she ended up arrested when her getaway flight was delayed -- because the airport ran on Google Apps]].

* ''WebVideo/UnwantedHouseguest'': In the comic Dr. Tigani [[spoiler: is killed by the X-Ray machine he intended to use on Melody.]]

** [[spoiler:Alexandria]] tried to gaslight Taylor into lashing out in a way that would ruin her credibility. However she was gauging how hard she needed to push to get this reaction based off Taylor's body language, not realizing Taylor was shunting those reactions into her swarm to stay composed. As such [[spoiler:Alexandria]] was caught off-guard when Taylor snapped and successfully smothered her.
** [[spoiler:[[BigBad Jack Slash]]]] suffers a FateWorseThanDeath at the hands of [[spoiler:Gray Boy]], who he [[spoiler:had cloned in the first place to replace the original.]] In addition, Golem, the hero that orchestrated these events, is in fact [[spoiler:Theo Anders, who Jack had challenged to kill him two years previously]].

* ''LetsPlay/PartyCrashers'':

** In "[[https://www.youtube.com/watch?v=5nj3RLnNqwY Mario Party but the Magic Conch COMMANDS US]]", Nick for some reason decides to ask if he can ''not'' get a Star during the final 3 turns of the game, [[NoMeansYes banking on the Conch telling him "no"]]. [[spoiler:He is forced to give up 2 Stars due to the Conch replying "yes" to ''every'' question he asks. It isn't until his very last attempt on the final turn of the game when the Magic Conch finally gives him the "no" he's been looking for, in spite of insistence from the others that he would have gotten the Star much more easily had he just asked normally]].
** Early on during their game on ''Mario Party 3''[='=]s [[https://www.youtube.com/watch?v=Eay58RkhQmA Spiny Desert]], Brent receives the Wacky Watch from Toad, a rare item that causes the game to immediately go to the last 5 turns. Brent ultimately decides to use it on turn 20 (despite having a guaranteed victory) to add 5 more turns to the game just to show off the item. [[spoiler:This ends up costing him the game as Nick manages to overtake him in Stars during those extra 5 turns.]]

* ''WebVideo/GameGrumps'': Jon insists when playing the first ''VideoGame/DonkeyKongCountry1'' that he isn't going to go after secrets for a few reasons. The playthrough of ''VideoGame/DonkeyKongCountry2'' ends with a shitload of tension because Jon neglected to hunt for lives, forcing them to scrape for 1-Ups at the last minute.

* WebVideo/{{Kitboga}} is a scambaiter popular on Website/{{Twitch}} and Website/YouTube. One of the standard tactics of refund scammers is to claim that they will lose their job unless the target gives them back the excess money that they refunded, typically via gift cards. So, in [[https://www.youtube.com/watch?v=PZqWrHDYK1M this video]], Kitboga claims that he is Kelly from a company's Human Resources department. Then, when the scammer asks "Kelly" to go get gift cards, she tells him that if he wants her to do this, then he needs to do her job, which involves calling up various employees and getting their responses to a survey regarding their job satisfaction. Although he does some of this, when he fails to fill out and submit the form properly over multiple calls, she tells him that she has lost her job. At this point, he calls a number which he thinks goes to Kelly's boss, but which is actually Kitboga himself using his own voice, admitting that he's a scammer and telling the boss that he was the one doing the surveys and that he was taking advantage of Kelly and not to fire her. He then calls "Kelly" back and tells her that he's saved her job, only to say that he was lying to the boss about being a scammer and he still needs gift cards from her. Kitboga, unamused, eventually tells him as Kelly that not only has she lost her job, but now she's in legal trouble for giving a criminal company information and access to a company computer system.

* ''WebVideo/GameGrumps'': Jon insists when playing the first Donkey Kong Country that he isn't going to go after secrets for a few reasons. The playthrough of DKC2 ends with a shitload of tension because Jon neglected to hunt for lives, forcing them to scrape for 1-Ups at the last minute.

** While it did take some set up, [[spoiler: [[Franchise/{{Kirby}} King Dedede]]]] kills [[spoiler:[[Franchise/SuperMarioBros Wario]]]] via [[spoiler: Wario's own Waft by plugging up his butt with a Gordo.]]

* In ‘’Fkin Meteos’’, WebVideo/TheOddOne, as Brolaf, was caught trying to kill the enemy pink by Leona, he then got hit by the enemy Ahri’s Q, which gives her movement speed every time she cast it, causing her to be more aggressive, which ultimately resulted her getting caught by TOO’s axe and get herself killed by Irelia.
--> '''[=TheOddone=]''': That’s right, I’ve just Ahri’s movement speed bonus AGAINST HER.

* A rare heroic example from ''WebVideo/CriticalRole'': [[spoiler:In their first fight against Lorenzo, Molly attempted to use his [[CastFromHitPoints Blood Maledict]] to give Lorenzo disadvantage, but because of an unluckily high damage roll, accidentally knocked himself out in the process. It then looped around to Lorenzo's turn, who took the opportunity to stab Molly through the chest, killing him instantly.]]

* A rare heroic case in ''WebAnimation/NigelAndMarmalade'' : Nigel is well intentioned and tries to use his powers for good. But being an HeroWithFInGood it usually ends up poorly for the people he tries to help. And yes, that includes him when, for some reason, he casts his own spell on himself or on his house. Repeatedly.

* In the ''VideoGame/DwarfFortress'' LetsPlay, ''LetsPlay/{{Boatmurdered}}'', the players create a DoomsdayDevice that floods the area around the fortress with lava (and frequently use it against elephants and other enemies). In the end, they accidentally (?) burn an incoming trade caravan with it, set the fortress on fire, and as a result the inhabitants go mad and start killing each other (and/or just walk into the fire).

* ''WebAnimation/MetaRunner'': Lucks had spent nearly two years [[spoiler: covering up the fate of Lucinia, even willing to threaten and lie to the media and even his own Meta Runners just to keep it secret. Not only do his misdeeds eventually get exposed, but he ends up getting killed when Dr. Sheridan, the man who Lucks allowed to run his dangerous experiments unchecked and start this whole dilemma in the first place, takes control of Masa’s Meta Runner arm and shoots him point blank in the head. And for extra irony, Sheridan uses the exact same gun Lucks did to shoot off Masa’s original arm.]]

* ''[[WebAnimation/Supermarioglitchy4sSuperMario64Bloopers SMG4]]'': Francis, the main antagonist of the Anime Arc, ends up getting killed by one of his own machines, called the Ink Zuccer, which he used to forcefully extract ink from inklings in order to fuel Inkweaver. Plus, even if that didn’t kill him, one of the beings he created from Inkweaver self-destructing certainly would have.