Examples of IdiotBall in FanWorks.
[[AC: ''Literature/ASongOfIceAndFire'']]
* In Obara VII of ''Fanfic/WearingRobertsCrown'', two Dornish emissaries approach Aegon Targaryen who's planning to return to Westeros, anticipating that he can carry out a lightning assault on the capital and that most of the Seven Kingdoms will be neutral, favourable or at least unable to oppose him in taking the crown. At a time when [[spoiler: the Wall has fallen, the king died heroically and Stannis Baratheon is uncontested as Regent to the young heir]]. Just to make this clear, [[spoiler: Viserys Targaryen]] had concluded that his feud with House Baratheon is less important that fighting the Others! To quote one review: 'Aegon, Jonny C, The GC, and Dorne weren't just holding the Idiot Ball, they were having kinky, filthy sex with it.'

[[AC: ''Manga/{{Bleach}}'']]
* In ''Substitute School: First Semester'', Tatsuki, Orihime, Sado and Ishida have had bangles placed on them by the Gotei 13 to seal their powers, prevent their reiatsu from attracting hollows and make it so their reiatsu doesn't mess with {{Muggles}}. They then decide to ask Urahara to remove them. Ichigo points out they are essentially going against an army when none of them are captain class and he can't help because he would side with the Gotei 13. They still persist their point even when Ichigo unloads ''MULTIPLE'' reasons why they shouldn't.

[[AC: ''ComicStrip/CalvinAndHobbes'']]
* There are a few of these snatched by the protagonists of ''Fanfic/CalvinAndHobbesTheSeries'', who are usually quite smart, don't always realize that one of Calvin's inventions could completely avert a conflict. Granted, Hobbes is ''very'' reluctant to go along with Calvin if an invention is involved, but the other protagonists don't really have an excuse. Particularly egregious is "Nighty Shut Up!", where the solution to Calvin's insomnia is to use the Time Pauser to sleep as long as he likes. This only comes at the end of the episode, while it probably wasn't very hard to figure out at all!

[[AC: CrossOver]]
* In ''[[{{Fanfic/AceCombatTheEquestrianWar}} Ace Combat: The Equestrian War]]'', Rainbow Dash trusts [[spoiler: Gilda]] who wants to talk with her about something. Considering the last time Rainbow saw her was after Pinkie Pie's party, [[{{BlatantLies}} there's absolutely no way she would do Rainbow any harm]].
* You wanna know how bad the CaptainObviousReveal is in ''FanFic/TheEndOfEnds''? In Beast Boy's letter to the Titans, he lists his true name: [[FirstEpisodeSpoiler Garfield]] ''Logan''. And no one, not even Beast Boy's ''former'' group, The Doom Patrol, managed to figure out Count ''Logan'''s true identity.
* In the ''{{Series/Firefly}}[=/=]Series/DoctorWho'' crossover fanfic ''Fanfic/TheManWithNoName'', some of the characters are hunting Reavers. When they stop, thinking they've heard something, [[ItsProbablyNothing the Doctor keeps going anyway]], walking smack right into one. Even the Doctor admits it was blindingly stupid.
* ''FanFic/OriginStory:'' Everyone who reacts to Alex Harris first escaping from SHIELD and then defeating the Avengers handily with the idea that throwing more guys at her is a good idea is carrying this.
* PlayedForLaughs in ''FanFic/ChildOfTheStorm.'' Harry kvetches to Carol about having to carry [[BigEater Ron]] up eight flights of stairs after the latter falls into a food coma. Not only is he [[ForgotAboutHisPowers both a telekinetic and a wizard who knows how to do a basic Levitation Charm,]] he also has a pair of highly intelligent, pony-sized wolves with him who would probably be willing to carry Ron on their back.
** Snape grabs it firmly in the sequel, when he, as per canon, makes a snarky remark about Harry [[spoiler: supposedly entering his name in the Goblet of Fire]]. Pissing off a demigod is stupid enough. Doing so when said demigod currently has a HairTriggerTemper thanks to having just recently been put through a TraumaCongaLine? He's ''lucky'' that all Harry did was to be rude back.

[[AC: ''Manga/DeathNote'']]
* In ''FanFic/ThePrinceOfDeath'' Light [[ExplainingYourPowersToTheEnemy explains all about his powers and his]] KryptoniteFactor to [[ArchEnemy L]].

[[AC: ''Franchise/{{Digimon}}'']]
* At one point in the ''FanFic/TamersForeverSeries'' the tamers find themselves forbidden from leaving class to go stop some rampaging digimon. ''Why'' they did not simply knock the teacher unconscious and run to the rescue ''anyway'' is baffling.
** Ms. Asaji herself as well, for putting "rules are rules" above the threat of rampaging Digimon. [[spoiler:Considering she turns out to be an agent for Takeru, it may have been a deliberate move to force Takato to handle the situation alone and gain more control of his [[SuperpoweredEvilSide powers]]]].

[[AC: ''Manga/FairyTail'']]
* One FandomSpecificPlot for ''Manga/FairyTail'' fanfics involves the rest of Lucy's team falling for a WoundedGazelleGambit by [[RonTheDeathEater Lisanna]], and proceeding to beat Lucy up and/or kick her out of the team. ''[[https://www.fanfiction.net/s/10733441/1/Another-Chance Another Chance]]'' is particularly bad about this, as none of the Dragon Slayers present when Lucy's getting beaten up (Natsu participates, while Wendy and Gajeel don't attack Lucy but don't try to stop it) consider that Lisanna's wearing makeup, even though they have enhanced sense of smell, and even [[OnlySaneMan Makarov]] can smell it, and Lisanna's CrocodileTears cause it to run. Lucy lampshades this when she bitterly complains about Levy, a close friend, believing Lisanna's word over hers even though the two aren't as close, and when she yell "You idiots! Haven't you heard of make-up?!"

[[AC: ''Disney/{{Frozen}}'']]
* In ''Fanfic/WhatAboutWitchQueen'' Weseltonian king Charles[[note]]Or prince. The story alternates between the two. Anyway, the ruler of Weselton.[[/note]] seems to catch it once Kai and Kristoff arrive. He's [[spoiler:at war]] with the queen who can control ice, he knows what happened to Hans, and he knows that Elsa's patience has its limits. And he still prolongs the negotiations to get better terms and claims that Elsa's weak. Even his own son calls him out on this.

[[AC: ''Anime/GirlsUndPanzer'']]
* In ''Fanfic/BoysUndSenshado'', Mako, typically Oarai's [[BadassDriver best driver]], suffers a drastic loss of competence around the time she [[spoiler:almost runs over Miho]].

[[AC: ''Franchise/HarryPotter'']]
* Rose Potter, from ''The Girl Who Lived'' series, tends to get thrown the IdiotBall often, due to having [[GodModeSue special powers that Canon Harry lacked]], which would allow her to solve the plot before it even got started, unless she did something [[WhatAnIdiot entirely stupid]]. For example, in Rose Potter and the Order of the Phoenix, Rose can control her connection with Voldemort, and knows Occlumency and Legilimency. Thus, she knows that the image of Sirius Voldemort sent her was fake. What does she do? Why, exactly what Canon!Harry did, except she did it in full knowledge that it was a trap. Did she tell Dumbledore, and with him, the Order of the Phoenix? No. Did she, knowing that her going there with a few friends was exactly what Voldemort wanted, and with no reason to take the bait, did she do nothing and inform the adults who wouldn't be playing into Voldemort's hands by walking into his trap? No. She, although she has no reason to, does exactly what Voldemort wants her to do, and is considered smart for doing so.
* The goal of ''Fanfic/HarryPotterAndTheMethodsOfRationality'' seems to be to avert this.
** Although, it does get a lampshade in chapter 63, when Moody mentions a drug called "Bahl's Stupefaction", the effects of which include causing the user to do extremely stupid things.
** The fanfic ends with [[spoiler:Voldemort having Harry, who has his wand and nothing else, surrounded by Death Eaters who are ordered to shoot Harry if he does anything. So does Voldemort take away his wand so Harry would be completely helpless? No. He instead acts even stupider than his book counterpart and lets Harry keep his wand allowing him to kill all the Death Eaters and mindwipe Voldemort.]] For such a smart guy he sure gripped the ball hard in his final moments.
* The cast of ''Fanfic/HogwartsExposed'' grab the IdiotBall frequently, but special mention has to go to the scene in which Harry, Hermione and the entire Hogwarts faculty get outwitted by Crabbe and Goyle.
* ''[[https://www.fanfiction.net/s/5686049/1/Love-Triangle Love Triangle]]'' is practically nothing but Harry and Hermione taking turns grabbing the idiot ball ''over and over again''. As a result of self-doubt and largely ignoring what they ''know'' about each others character, it takes ''over a year'' for them to mend a broken relationship which ''wouldn't have been broken to begin with'' if they'd just taken more care about what they said in anger and agitation.

[[AC: ''Franchise/KingdomHearts'']]
* PlayedForLaughs in the ''VideoGame/KingdomHeartsBirthBySleep'' fanfic ''[[http://www.fanfiction.net/s/6391645/1/Reaching_the_Understanding Reaching the Understanding]]'', which turns Terra's tendency to be [[HorribleJudgeOfCharacter overly trusting of the wrong sort of people]] into a RunningGag by way of a chain of {{Gilligan Cut}}s.

[[AC: ''WesternAnimation/MyLittlePonyFriendshipIsMagic'']]
* ''Fanfic/TheConversionBureau'' story called ''An Azure Future'' has the protagonist grasping multiple Idiot Balls. After an entire story of wanting to remain human and not undergo conversion, the protaganist pulls a complete ideological 180, joins up with a terrorist organization and helps them successfully carpet-bomb a human settlement, then gases a cop whose only mistake was trying to give him a speeding ticket. Making the whole matter worse, the only reason he decided to help the terrorists was so they would convert him in exchange - something that is their ''entire purpose'' to do anyway. Not to mention he could've walked into any of a dozen nearby Conversion Bureaus and had the process done legitimately by trained professionals at any time. He receives nothing worse than mild disappointment from Celestia for the whole thing.
* Lampshaded in ''Fanfic/PinkPersonalHellAndAlteringFate'' where Pinkie Pie tries to make Dominic laugh and throws flour all over him. He doesn't find it very funny... and tries to wash it off with ''water'', ignoring Pinkie Pie's warning ''not'' to.
* In ''WebVideo/MyLittlePonyTotallyLegitRecap'' Twilight and Spike share a "Common Sense Switch" between them, and whoever it's flipped on towards will be the rational one for the episode while the other's dumb ideas will drive the plot. Most clearly seen when Twilight attempts to babysit while running a bunch of errands, including visiting a hospital of sick children, and going through all the trouble of winning back her stolen crown instead of just taking it back (albeit with a belated justification), all over Spike's consistent and rational objections.
* ''FanFic/EscapeFromTheMoon'': The decision to make Spliced Genome [[spoiler: immortal]] was decried by countless as an ill advised measure, including Spliced Genome herself. The people holding the Idiot Ball disagreed. In the sequel ''The Mare From the Moon'', Spliced Genome ''was'' content to wait out her time on the moon, and had been reforming slowly after almost three hundred years of no conflict between her and her jailers. But then one of them grabbed firm hold of this trope and activated a death trap, triggering her RageBreakingPoint. [[spoiler: Word of God is that it was done by an individual without permission and against standing orders to leave her alone.]]

[[AC: ''Series/MysteryScienceTheater3000'']]
* In the [=MST=] treatment of ''FanFic/TomSwiftAndHisWarTank,'' Ned and Mr Damon keep a firm grip on the idiot ball at all times, but it seems that everyone who isn't Tom gets their sticky mitts on it at some point.
-->'''Servo''': Ah, it all becomes clear, now. The residents of Shopton, except for the Swifts, share a collective intelligence. Someone else in town must be buttoning their coat and thereby placing a strain on the town's remaining IQ resources.

[[AC: ''Manga/{{Naruto}}'']]
* From ''[[https://www.fanfiction.net/s/4991314/1/Escape-from-the-Hokage-s-Hat Escape from the Hokage's Hat]]'', we have the advisers council (Homura and Koharu) and the Daimyo. See the council want to banish Naruto and have convinced the Daimyo to agree both saying it's part of a TheNeedsOfTheMany type situaton. This is naturally pointed out as stupid since Konoha is recovering from an invasion and kicking out the PersonOfMassDestruction who can either protect the village or act as a deterrent to any attacks is just asking for trouble.
* Naruto in ''[[http://www.fanfiction.net/s/5012103/1/That-Look That Look]]'' at times seems to juggle as many [[IdiotBall idiot balls]] as he can find. Perhaps the worst is that he required several explanations to understand why a reservoir that supplies over 70% of Suna's water would be a good military target, despite knowing full well that Suna is in the middle of a desert.
* Ino in ''[[https://www.fanfiction.net/s/3665921/51/Black-Flames-Dance-In-The-Wind-Rise-of-Naruto Black Flames Dance in the Wind: Rise of Naruto]]'' throws real kunai at the training grounds instead of practice ones (which have a foam tip) and nearly hits Sakura when she misses her target. What makes it worse is her sensei had previously chewed her out for that very action, citing that not only could she kill someone doing that, but one such death once caused a blood feud between two clans.

[[AC: ''Franchise/NeonGenesisEvangelion'']]
* ''Fanfic/TheChildOfLove'': Sigh. Shinji. [[spoiler:Your own unborn daughter is warning you telepathically about your father's plans and asking you being strong and being there for Asuka and her.]] And what do you do? Losing your nerve and breaking up because you think you are not strong enough to protect them.
* ''Fanfic/NobodyDies'': Kaworu is very enthusiastic about [[LampshadedDoubleEntendre maintaining the species]] with Rei. The Idiot Ball? The first attempt fails by loss of [[NoodleIncident Ocular Virginity]]. The second by [[DestinationDefenestration Defenestration]]. He still tries.

[[AC: ''Anime/{{Pokemon}}'']]
* In ''[[Anime/{{Pokemon}} Ash's]] [[FanFic/NewLookSeries New Look]]'' the titular character thought a place named "Salon Rocket" was a bit suspicious and went in to investigate. He then sees Team Rocket in a PaperThinDisguise and asks if they met before. This eventually resulted in Ash getting a makeover by them.
* The entire plot of [[Fanfic/ProjectChimeraTheAtticHypothesis The Attic Hypothesis]] was set in motion by an idiot ball rolling down the metaphorical hill of scientific advancement.

[[AC: ''VideoGame/{{Portal}}'']]
* Explored in ''FanFic/BlueSky'', wherein Wheatley discovers that he was originally designed to be [=GLaDOS=]' idiot ball in an attempt to stop her going genocidal every thirty seconds.

[[AC: ''Franchise/SonicTheHedgehog'']]
* A huge portion of the central conflict in ''FanFic/SonicXDarkChaos'' could've been avoided if [[spoiler: Maledict had come right out and told Sonic that he was his father and that he needed his help]] ''before'' Tsali got there first and tried to kill Sonic. Also, the Metarex leaders continued to trust M/[[spoiler: Maledict]] even while they were slowly ''losing'' the Metarex War. Also, Tsali grabs it in Episode 73 - he could've easily killed Cosmo and her friends by simply blowing up the Blue Typhoon, and only storms the ship because he's so AxCrazy that he wants to watch them suffer.

[[AC: ''Franchise/StarTrek'']]
* {{Lampshaded}} in "Fanfic/PastContinuous". Eleya remarks in her InternalMonologue that the coalition could have avoided a lot of trouble by basing the effort to retake Deep Space 9 out of a nearby Bajoran military base instead of the middle of a major city.
* In the ''Star Trek: Renegades'' pilot, everyone seems overly fond of the "vaporize" setting on their phasers, even when it might be useful to question someone. When TheManBehindTheMan shows himself, Chekov's security expert immediately kills him, despite knowing that he may be the only one who can stop [[spoiler:the portal about to destroy Earth]], simply shrugging and referencing old habits when the incredulous Chekov asks why. Borrada also holds the ball when he continues to blame the Federation for something that it supposedly did ''before'' it was ever founded.

[[AC: ''TabletopGame/Warhammer40000'']]
* ''Fanfic/AllGuardsmenParty'': Nubby takes firm possession of this during the ''Discount Spaceship'' chapter - it starts with buying the hunk of junk that is the Occurrence Border and escalates from there.

[[AC: ''Franchise/WhoseLineIsItAnyway?'']]
* In the fanfic ''IProopedMyPants'' all of the characters get this at some point. After their mansion burns down, the Zharjeks all take minimum wage jobs at a hotel, even though they are still supermodels. And when the Mafia kidnaps [[spoiler:Tiffany]], they let her use her phone as long as she doesn't use it to call the police.