->'''Rarity:''' Oh Fluttershy, would you be a dear and ''fly faster please!''
->'''Fluttershy:''' I can't!
->'''Twilight:''' If you can't catch [Rainbow Dash], Discord wins!
->'''Fluttershy:''' That big... dumb... MEANIE!
-->- [[http://www.youtube.com/watch?v=sspE4a6gpmE This]] scene from ''WesternAnimation/MyLittlePonyFriendshipIsMagic''

This is when wanting to avoid letting a particular character be victorious provides fuel for the other character's [[{{Determinator}} persistence]] in fighting against them.

It is a spiteful component of persistence; even when it's the good guys who feel this way about the bad guys, it [[AntiHero raises some form of moral ambiguity that this fuels it]]. On the other hand, this is also used in cases were the character in question winning [[OmnicidalManiac really would be a very ]] [[DystopiaJustifiesTheMeans bad idea]].

See also SpitefulAI. This is one of the main drivers of political maneuverings both in fiction and in RealLife. See EnemyMine, BalanceOfPower, etc.

!! Examples:

[[AC:{{Anime}} and {{Manga}}]]
* Parodied in ''Manga/SketDance''. Telling the Student Council or the Sket Dan that the other group is involved in something is a perfect way get to them to join in. This is especially pronounced with Tsubaki and Bossun, due to [[spoiler:SiblingRivalry]].

[[AC:{{Film}}]]
* Batman's insistence in ''Film/TheDarkKnight'' on not letting SelfDemonstrating/TheJoker win [[spoiler:is what drives him to make a ZeroApprovalGambit in order to preserve Harvey Dent's image.]]
* Disney's ''Disney/TheHunchbackOfNotreDame'' has the gargoyles trying this on Quasimodo, [[spoiler:who responds to "you can't let Frollo win" with "[[SubvertedTrope he already has]]." Then on hearing Frollo's words as he tries to burn Esmeralda alive, [[DoubleSubversion Quasimodo changes his mind and keeps fighting anyway]].]]

[[AC:{{Literature}}]]

* In ''TheChroniclesOfNarnia'': ''TheMagiciansNephew'', Jadis has this attitude towards her sister. She wipes out her entire planet rather than let her sister win a civil war and become queen in her stead.

[[AC:LiveActionTV]]
* In the ''FatherTed'' episode "Cigarettes and Alcohol and Rollerblading" after being goaded into giving up something for Lent by [[SitcomArchNemesis Father Dick Byrne]], Ted gives Dougal a lecture on the importance of Lent, something far more important than the sacrifices made by Jesus as the latter points out, but beating Dick Byrne at his bet.

[[AC:TabletopGames]]
* [[http://ynnen.blogspot.com/2005/08/king-is-dead-long-live-king-kingmaking.html This]] essay on the KingmakerScenario calls this "The Vendetta" - whatever the reason, player A no longer cares about trying to win the game themselves, and has adopted an attitude of "I'm going to do everything in my power to make sure player B doesn't win."

[[AC:WebOriginal]]
* In Creator/AchievementHunter's ''[[LetsPlay/AchievementHunterMinecraftSeries Let's Play Minecraft]]'', this used to be pretty much the team's thoughts on [[Creator/GavinFree Gav]][[{{Troll}} in]]: if he's close to victory, they'll pull out the stops to make sure he doesn't win.
* If you replace AH with the Creator/UltimateSidemen, ''VideoGame/{{Minecraft}}'' competitions with ''VideoGame/GrandTheftAutoV'' races, and Gavin with WebVideo/KSIOlajidebt, you will have the same ordeal; a popular British gamer getting screwed over by the rest of his mates.

[[AC:VideoGames]]
* In the ''VideoGame/MortalKombat'' [[VideoGame/MortalKombat9 reboot]], [[spoiler:this gets ''inverted'' as Raiden finds out the prophecy of "[[ArcWords He must win]]" means that Shao Kahn must take over Earth in order for the realms to be saved from Armageddon. Though played straight in the sense that Shao Kahn ''is'' the Armageddon the realms need to be saved from; it's just that, if he is allowed to conquer Earth in the past, then the Elder Gods will destroy him before he can attain godlike power in the BadFuture.]]

[[AC:WesternAnimation]]
* The ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' two-parter "Return Of Harmony" has Fluttershy flying faster on being told the alternative is to let Discord win.
** Applejack and Rainbow Dash's race in "Fall Weather Friends" slowly devolves from a friendly competition to [[DickDastardlyStopsToCheat using any trickery and dirty tactics to rob the other of victory]] after both are convinced the other tripped them over. By the end they are so busy beating each other senseless they ''both tie for last place''.
* Plankton of ''WesternAnimation/SpongebobSquarepants'' is a conniving sociopath who usually wants to steal the Krabby Patty formula and take Mr Krabs' hard earned success. However, even when Plankton is using legitimate methods to gain customers, Krabs is insistant on sabotaging any profit he makes and claiming it for himself. This reached such obsessive grounds that Krabs became obsessed with destroying Plankton when he gained ''one customer'', making it not just a case of "X Must Not Win" but "X Must Not Lose Humbly".
* Kyle's feud with Cartman in ''WesternAnimation/SouthPark'' is usually justified given the latter's highly malicious intent. However even in petty wars, Kyle takes a sometimes disturbing extra mile to make sure Cartman's plans go up in smoke. eg. In "Douche And Turd" he and Cartman create opposing school mascots, with Kyle using increasingly manipulative methods to get people to vote against Cartman's candidate. Similarly ''a lot'' of Cartman's intentions are built around making Kyle lose.
-->'''Butters:''' Whoa, you sure seem with it, Eric. You must have some... ih-inspiration.
-->'''Cartman:''' Yes, the tears of Kyle Broflovski when he loses his ten dollars to me.
** To add onto the Cartman example, there are plenty of occasions Cartman comes out with amazing success and fame due to a bet with Kyle, but brushes it all off because he didn't win the bet in particular. In "Christian Rock Hard" for example, Cartman bets Kyle he can make a Platinum album before him. Cartman succeeds in making a highly successful Christian rock band, gaining enormous popularity and wealth. However once he finds out that Christian record labels don't give out Platinum albums (thus he can never win his bet with Kyle) [[VillainousBreakdown he flies into a rage in public]], destroying the band's career.
*** And for more Cartman, in "Fat Butt and Pancake Head," Cartman pretends he (or his hand, at least) is JenniferLopez. "Ms. Lopez" creates a hit album, gets affectionate with Creator/BenAffleck, and enjoys the wealth and fame of celebrity life via XanatosSpeedChess. The reason is to make Kyle admit the possibility that the hand is an independent living being from Cartman and calls the whole thing off when Kyle makes even the tiniest admission. [[spoiler: In the episode "200," the hand is proven to be an actual separate entity.]]
*** However, when Cartman does win, he's still not satisfied unless he can rub the victory in Kyle's face indefinitely. In "Red Hot Catholic Love", after spending most of the episode gloating over winning their bet (about if it's possible to [[ItMakesSenseInContext crap out of your mouth]]) Kyle being a GracefulLoser makes him so angry he storms off and even leaves the money behind.
* Similar to the Kyle example above is Dib from ''InvaderZim''. Though Dib primarily clashes with Zim to keep the latter from conquering the Earth, Dib can't abide Zim succeeding even in low-stake battles. The best example is in "Door to Door", where literally Dib's only reason for participating in the titular fundraiser is to keep Zim from winning first place and the "secret prize".
* In ''{{Peanuts}}'', whenever Charlie Brown has any real chance of winning something, someone has to be around specifically to prevent him from achieving the victory, usually Snoopy.
** The most prominent case is in ''ABoyNamedCharlieBrown'', where he is one of the two remaining contestants on a winner-takes-all national spelling bee. Charlie Brown screws up spelling "beagle" due to a combination of Snoopy (who is a beagle) following him along and worry over Linus getting angry at Charlie Brown for a trivial reason.
** In ''RaceForYourLifeCharlieBrown'', Charlie Brown's team is set to win the river race, but the bullies sabotage his boat, allowing Woodstock to win.
* Bertram of ''WesternAnimation/FamilyGuy'' will do anything to destroy Stewie, even if it means creating a time paradox that ''destroys the entire time space continuum'' in the process.
-->'''Bertram:''' Worth it!!!
* Shown to quite a detrimental level in ''WesternAnimation/TheSimpsons'' episode "Trash of the Titans", since Homer's campaign is based largely on a spite war towards incumbent Ray Patterson, he proves completely incompetent when he finally gets the job.
* The ''WesternAnimation/LooneyTunes'' "Hunting Trilogy" generally convey DaffyDuck as this towards WesternAnimation/BugsBunny. While touting himself as a self proclaimed self preservationist, Daffy takes increasingly stubborn lengths to make sure Bugs gets shot by Elmer Fudd instead of him, to the point of even berating and directing Elmer, the very guy he's trying to avoid, to shoot Bugs (which always end up backfiring onto him). In both "Rabbit Seasoning" and "Duck Rabbit Duck" Daffy's downfall stems from coming out of his hiding place at the start of the cartoon when Bugs is already outsmarting Elmer, not satisfied with coming out safe but Bugs not getting shot.

[[AC:Other]]
* Often times PETA's involvement in a cause will lead many people to oppose the cause more than they would otherwise, simply because they despise the thought of allowing PETA victories.