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Anime and Manga
- Sosuke Aizen, the Big Bad of Bleach, is a big offender of this; one could even make the case that this was invoked to justify this behemoth's downfall. He more or less singlehandedly takes out the entire cast with a mixture of Magnificent Bastardy and being one of the strongest shinigami in existence, but as the final battle approaches, he devolves in a fairly straightforward monster (literally) who tosses aside his lucidity in favor of brute strength, as he feels no one can reach the necessary level of power to defeat him anymore and he can afford to just power on through everything without strategy. It doesn't end well for him.
- Mobile Suit Gundam AGE: Zeheart Galette seemed to get more and more stupid and crazy as the third generation went on, culminating in ordering Fram Nara into a suicide attack that didn't work, and then killing some of his own men. He then took to a Mobile Suit battle in a blind rage and got killed in ten seconds, despite having both a machine and the piloting skills to make him a match for the main characters.
- The Namek saga is notable for the guerilla-style tactics that the heroes are required to use throughout: Krillin and Gohan are no match for most of Frieza's elite henchmen, Vegeta is slightly higher up the power scale and ascends higher but is still forced to play it smart to outwit the godlike Frieza. By the end of the saga, Vegeta directly challenges Frieza in his final form. Even though he can sense ki and could probably sense just how utterly enormous Frieza's power was compared to his own.
- Frieza reveals to Goku during their fight that he's only using a tiny percentage of his power, which he then proves by upping his power to half of its maximum to smash monkey. So it's actually not unlikely that Vegeta couldn't sense just out outclassed he was. Not that this sort of behavior is out of character for him.
Film - Animated
- In Hercules, Hades has managed to get Hercules to agree to give up his super-strength in exchange for Megara's survival and safety. So, what does Hades then do? While he's taking over Mount Olympus, he sends a giant Cyclops to attack Hercules, who will no doubt be with Megara, thus making it highly likely that she will be harmed in the crossfire. And since the deal is immediately nullified if she's harmed, he has effectively ensured that his plan will fail.
- This happens in Scooby-Doo! and the Witch's Ghost. The gang go to help a man named Ben Ravencroft clear his ancestor's name because she was accused of being a witch. Once they find her book, he reveals that she was one. As he tells them that he's going to release her from the book, get magic powers, and basically destroy all, they only give him the "You won't get away with this" speech and WAIT FOR HIM TO SUMMON HIS POWERS!! Of course, they're not going to tackle him before he reads the book aloud, otherwise the movie would be over.
- Sakharine of The Adventures of Tintin is a very smart villain, preparing for many different disasters, keeping enemies alive only when their information is needed, being careful to not commit open robberies of the MacGuffins, and pulling a I Surrender, Suckers on the good guys. Then when threatening to destroy the treasure map, he chooses to monologue at length about how the heroes have failed to beat him, buying enough time for Tintin to sneak around and steal it from him.
Film - Live Action
- Near the end of Red Dawn (1984), Jed gets the drop on Colonel Strelnikov by sneaking up behind him. But instead of just shooting him, he first announces his presence with the line "You lose". This gives Strelnikov enough time to open fire on Jed before he dies, inflicting critical injuries.
- The original ending of A Perfect Murder (the remake of Dial M for Murder) was an aversion of this. The wife shoots her husband for trying to have her killed, and fakes a struggle. Since she had evidence he planned to have her killed, the police shrug it off, and she actually commits the perfect murder. But it was decided that the audience couldn't morally identify with her, and then we had the wife doing this trope.
- Once upon a Time in Mexico: The Femme Fatale spots her ex-boyfriend wounded in the street from a distance; the sensible thing to do would be to snipe him, as she was perfectly capable. But instead she goes down to talk to him, so that they could have a dramatic final exchange and so that Sands could shoot her.
- None of the characters in Hellboy II: The Golden Army make intelligent decisions in the third act, which lead to the villain getting the MacGuffin and the Love Interest dying (although critics felt it didn't hurt the overall film).
- The movie Underworld when the Big Bad has rendered the hero completely helpless and has him on the floor at his feet... but then walks away to deal with another problem. The hero of course recovers and saves the day.
- Of course, the Hero is the spitting image of his dead daughter - a daughter he'd already been mortified by having to kill before. It was possible he wasn't able to bring himself to deliver the killing strike this time.
- In Draft Day, the Cleveland General Manager (Kevin Costner) is tricked into an epically bad trade by the Seattle GM. That level of stupidity happens about once every 20 years. The movie is about Costner dealing with the fallout amid team politics, etc. Then, in Act Three he manages to pull of two even more unlikely trades - one against the now suddenly stupid Seattle GM.
- Camp Nowhere: After having spent the entire movie managing to keep their fake summer camp from being discovered, and after spending most of Parents' Day fooling the parents, the kids start celebrating their victory before the last group of parents has left. Had the kids paid ANY attention to their security monitors, they would have noticed debt collector Polk at the front gate. Things then go From Bad to Worse when Polk runs into Mud's dad, as it eventually leads to the ruse being uncovered.
- Vantage Point: Veronica, who has killed or helped kill dozens of people, including children, ruins the terrorists' plan because she can't run over a little girl. At this point the terrorists had succeeded at everything. All they had to do was literally drive away in triumph.
- Poltergeist. Steven and Diane Freeling acted with reasonable intelligence throughout most of the movie - not perfectly, but then they had no experience with this type of terror. However, after managing to rescue Carol Anne from a demonic ghost, they decide that Diane, Robbie and Carol Anne will stay in the house overnight. Not only that, but they let Robbie and Carol Anne stay alone in the same room that Carol Anne was originally stolen from. Would you take that kind of risk with your kids?
- Hans Landa in Inglourious Basterds is made out to be a smart mind, but in the final chapter he decides to trust his opponents' words and delivers himself to them without a backup plan.
- Double-subverted in Artemis Fowl: Artemis specifically refers to the "third stage of operations" as the time not to get careless, and then sends Juliet downstairs to check on Holly, who has regained her magic. Although he didn't know it at the time.
- Thrawn in his Star Wars trilogy. The author has openly admitted that he couldn't think of any way, realistically, for the good guys to win against the relatively intelligent and cautious master strategist, and that he had to take up the Idiot Ball for the last few chapters to give the story its happy ending.
- The Lies Of Locke Lamora has a case of this when Locke and Jean take on the Falconer, who can use magic to control people whose true name he knows. The Falconer realizes that "Lamora" is a fake name, but it never occurs to him that "Locke" is also assumed, which of course it is. Without any part of Locke's true name, the Falconer's spell fails, allowing Lock to overpower him.
Live Action TV
- Harmon Rab and Sarah Mackenzie of JAG are often guilty of this. When it came time for the episode climax, they would often confront the bad guy alone. They are partners, but they seem to forget that when it comes to one of the very reasons law enforcement has a partner system.
- Especially since they are lawyers and not NCIS agents. Mac was a Marine, and a badass one at that, but still.
- Charmed Zankou, S7's Big Bad is smart enough to come up with some cold-blooded torture that weakens the sisters' confidence enough so he can steal the Book of Shadows. Then in the finale his IQ seems to plummet and the sisters manage to goad him into doing something stupid so they can attack him. It was a shame because he was one of the few worthy opponents they had up to that point.
- Part of the fun of Columbo was zig-zagging this. He seems like a fool, and even seems to fall into this, but it's all an act. The irony is his act is an attempt to invoke this trope, seeming careless, stupid and oblivious so his enemies will slip up and Columbo can nail them.
- Doctor Who:
- The Big Bad in the special "The End of Time" tells the Master in the most insulting terms that the moment his plan (which the Master is an essential part of) succeeds, the Master will be killed. While the Master is standing next to the machine that forms another essential part of the plan. He also passes up numerous opportunities to shoot the Doctor despite having previously shown a willingness to kill people for disagreeing with him; and the Doctor isn't part of his plan.
- In the original series story "The Brain of Morbius", the Doctor defeats and captures Morbius by the middle of the last episode, deciding to remove his brain and return it to the Time Lords. It's fairly logical for him to threaten Solon, the Mad Scientist responsible for giving Morbius his new body, into doing the job for him. It's less logical for him to leave Solon alone to do the job and go and check on Sarah in a room with a lock on the door. To the surprise of no-one but him, Solon locks them in and revives Morbius.
- In the Criminal Minds episode "Our Darkest Hour", the detective helping the team on the case, Matt Spicer, experiences this and forgets protocol at the end of the episode, leading him and Morgan into Spicer's house without waiting for backup, allowing the Unsub to trap them, kill Spicer, incapacitate Morgan and kidnap Spicer's youngest daughter. It's justified in that Spicer was dealing with an issue in his family, which the Unsub had targeted once before and killed everyone except for him.
- In the third-season episode "Maveth" on Agents Of SHIELD, the current head of Hydra is holding Simmons hostage while her partner, Fitz, is off performing a dangerous mission on his behalf. At one point, Simmons overhears the evil scientists making a mistake in their calculations and corrects them, stating explicitly that she helped only to ensure Fitz's safe return. Instead of using this leverage to his advantage, the evil mastermind, who has for decades orchestrated an elaborate plot leading up to this very moment, informs Simmons that he has no intention of letting Fitz return alive, thus eliminating any incentive for her to cooperate with him.
- For all his Trickster and Evil Genius traits, in Norse Mythology Loki's fall was going to a feast with no exit plan and continually insulting everyone until they bound him under the earth with snake venom dripping into his eyes.
- Actually he was able to leave due to hospitality rules. He then proceeded to build a house with four doors so he could see danger coming from any direction. It was after this that he was captured.
- Hugo Strange in Batman: Arkham City. He spends most of the game and the prequel comics matching wits with Batman, who has a lot of trouble genuinely messing with his plans because Strange has studied him so thoroughly. In the last third of the game, Strange takes a hostage over a video screen, forcing Batman to stay still while he lectures him and his goons fill the room. Instead of forcing Batman to not fight back for the sake of the hostage, Strange just lets him go, allowing Batman to knock out all of his men. And despite how familiar he is with Batman's tactics, when Batman begins climbing the tower to his control room and his thugs can't locate him, Strange just assumes he's fallen off.
- Batman: Arkham Knight ultimately plays this trope straight, but not without some heavy zig-zagging first. By the endgame, Scarecrow has scored a major victory by covering Gotham City in the Cloudburst fear toxin, and plans to do the same to the entire American East Coast. Scarecrow is content to sit back and watch Batman suffer; but his Dragon, the titular Arkham Knight, who knows full well how dangerous Batman can be and specifically joined up with Scarecrow so he can get even with the Bat, is having none of it and decides to go after Batman himself. After the Knight reveals himself to be Jason Todd and is taken out by Batman, Scarecrow continues with his initial To the Pain plan as though nothing happened. Unbeknownst to Scarecrow, however, The Joker, who has been serving as Batman's Enemy Within for much of the game, begins taking over Batman's psyche the more Bruce is exposed to the fear gas. Even though Scarecrow manages to get Batman to unmask himself on national television, he still loses because he's so intent on breaking Batman through fear that he inadvertently allows Batman to win through fear toxin; first by allowing Joker to take over, then by showing him a Bad Future where the Monster Clown Attention Whore dies alone and forgotten, allowing Bruce to regain control.
- In BlazBlue, Hazama/YuukiTerumi fell hard on this trope. He spent BlazBlue: Calamity Trigger standing on the sidelines of the "Groundhog Day" Loop, memorizing everyone's patterns, carefully manipulating events, setting up lots and lots of preparations and playing Xanatos Speed Chess with Rachel Alucard, one of the few besides himself with Ripple Effect-Proof Memory, for the chance of breaking the time loop with a head start, all without letting slip he's a bad guy. And at the end of the first act/game, the loop is finally broken, all of his plans play out smoothly and everything ends in his advantage... In BlazBlue: Continuum Shift, he has a spell come into effect that allows him to observe all timelines of the Continuum Shift, effectively allowing him to choose the exact timeline in which the protagonists hold the Idiot Ball, he successfully forges Kusanagi: Sword of the Godslayer, outmaneuvers Takamagahara, and finally gets to declare himself the winner of the second act/game. Hey, I told you he was Crazy-Prepared... However, come BlazBlue: Chrono Phantasma, he makes several stupid, amateurish mistakes that ultimately end up getting him Killed Off for Real by the heroes midway through the third act/game...
- Justified Trope: Due to there being no more time loops, Hazama/Terumi suddenly couldn't take his time to memorize his opponents' moves, abuse trial-and-error for fun and profit and make numerous attempts to win until he came out on top, and thanks to the space-time continuum being messed up due to two warring gods, observing outcomes was rendered useless as well and, robbed of his cheats, Hazama/Terumi simply couldn't adapt to the real pace of the world.
- Likewise, this trope was actually foreshadowed during Continuum Shift EXTEND. Slight Hope serves as a control environment where Hazama is void of foresight regarding a single threat (an extra-continual Makoto) and has to adapt to it on the fly. Not only does he fail to properly evaluate the threat (going so far as to leak a vital detail to it), but he fails to keep in touch with his partner in crime Relius Clover for the event where said threat defuses the trap set for it via proxy. End result:
- Yoshiyuki in Da Capo II develops this during the Koko route. While he's never super perceptive about love, in this route he basically goes out of his way to be as incompetent as possible about the matter until the point the stupidity starts to edge into jerkassery. The most likely reason is that there's no real dramatic story set up for Koko; she loves Yoshiyuki, pretty much always has and has nothing seriously wrong with her life.
- In Fate/stay night, this is the (self-acknowledged) critical weakness of Rin - she gets all the little things right, gets all the middle-sized things right, and then screws it up when it really counts. This helps contrast her with Shirou, who's the opposite.
- In the finale of Avatar: The Last Airbender, Zuko tells Katara that he can beat Azula alone, which turns out to be true and is about to one-hit Azula the same way he did a few episodes back with his father (and at that time he was unprepared). Then he makes the mistake of taunting her. Katara makes the mistake of standing too close to the action. Result? Azula fires at Katara and Zuko is taken out of commission shielding her from the lightning, leaving Katara to finish what he started.
- It wasn't the taunt in of itself that was Zuko's mistake. He taunted Azula for the specific purpose of drawing out her lightning attack. You can even see Zuko preparing to redirect the lightning. Zuko's mistake (aside from not just swallowing his damn pride and not attempt to get Azula to use lightning just so that he can show that he can redirect it now) was that he underestimated how lucid Azula still was. Even in her Villainous Breakdown, she still thought clearly enough to realize that targeting Katara, not Zuko, was the best move.
- Luckily he survives, and because there are standard sportsmanship rules in an Agni Kai, Zuko still won the moment she attacked a spectator.