History DidntSeeThatComing / AnimeAndManga

** Vegeta removes Fat Buu from Super Buu's body, forcibly returning Buu to his original form. Although not as strong as Super Buu at his peak, he is the most dangerous from of Buu. Without a bit of hesitation, he destroys the Earth.

* In ''Manga/{{Kaiji}}'''s second season, Ootsuki has a seemingly foolproof way of cheating by [[spoiler:using dice that only have the numbers 4, 5, and 6]]. Kaiji manages to bluff being completely oblivious to the trick, which doesn't happen in Ootsuki's first two rolls as dealer, and, upon deducing that he's using the trick dice for his third roll, ensures that he won't be able to hide them by [[spoiler:grabbing the bowl ''before'' the dice have stopped.]] After using some InsaneTrollLogic, Ootsuki agrees to let the players roll against his own roll (which is assumed to be a 4) with [[spoiler:the use of modified dice being allowed, Ootsuki assuming that they'd use his own 4-5-6 dice, which, at worst would lose him 1 million perica.]] He didn't foresee [[spoiler:Kaiji having made his own set of dice out of steak bones that have a 1 on every face, guaranteeing Snake Eyes and a 5x payout, or that all this happened on his first turn as a dealer, meaning he has to go through that ''again''.]]

** [[spoiler:[[GodEmperor Yhwach]]]] also fails to see the [[spoiler:[[KryptoniteFactor Still Silver arrow]]]] coming due to its user [[spoiler:Uryū Ishida]] being completely immune to [[spoiler:Yhwach's]] powers. Then, when [[spoiler:Ichigo tries to cut him down and Yhwach tries to break Tensa Zangetsu before the blade can reach him]], he also doesn't expect [[spoiler:the original Zangetsu emerging from the broken shell of Tensa Zangetsu]]. [[spoiler:Both events culminate in his defeat.]]

** Much later, right after Aleister has finally gotten his plans back on track, an Unknown Unknown pops up and completely blindsides him: [[spoiler:World Rejector, a power completely the opposite of Touma's, appears out of nowhere]].

* ''Manga/{{Bleach}}'': Aizen is defeated by two things he fails to see coming due to the amount of false assumptions he had been making from the beginning. [[spoiler:He wanted Ichigo to become more powerful but failed to understand how powerful Ichigo was capable of becoming and the [[SentientPhlebotinum Hogyoku]] suddenly de-powered him before he could complete his fight with Ichigo. Ichigo believes Aizen was [[BeCarefulWhatYouWishFor de-powered]] due to possessing a deeply hidden desire to be a [[IJustWantToBeNormal normal shinigami]].]]
** [[spoiler:[[GodEmperor Yhwach]]]] also fails to see the [[spoiler:Still Silver arrow]] coming due to its user [[spoiler:Uryū Ishida]] being completely immune to [[spoiler:Yhwach's]] powers. [[spoiler:This plays a major role in his defeat.]]

** [[spoiler:[[GodEmperor Yhwach]]]] also fails to see the [[spoiler:Still Silver]] coming due to its user [[spoiler:Uryū Ishida]] being completely immune to [[spoiler:Yhwach's]] powers. [[spoiler:This played a major role in his defeat.]]

** [[spoiler:[[GodEmperor Yhwach]]]] also fails to see the [[spoiler:Still Silver]] coming due to its user [[spoiler:Uryū Ishida]] being completely immune to [[spoiler:Yhwach's]] powers.

* In the final battle of the Holy Knights saga, Hendrickson from ''Manga/TheSevenDeadlySins''was hit with three of them in the row. First, [[spoiler:[[TalkingAnimalHawk]] ]] jumped in front of his sure-to-kill attack, saving Meliodas. Then, [[spoiler:Hawk's [[BerserkButton death]]]] caused [[spoiler:[[TheHeart Elizabeth]] to unleash her hidden powers, healing everyone and damaging him]]. And then Meliodas, in a last ditch effort to defeat him, attacks him while everyone else fires their most powerful attacks on both of them. Hendrickson thought that he just tried to give the others a chance to beat him, by sacrificing himself -- [[spoiler:and then he revealed a secret technique that allowed him to collect damage from all these attacks and then release all that on him]].

* In the final battle of the first season, Hendrickson from ''Manga/TheSevenDeadlySins'' in the final battle was hit with three of them in the row. First [[spoiler:the hero's [[TalkingAnimal talking pig]] ]] jumped in front of his sure-to-kill attack, saving the main character. Then, [[BerserkButton the death of the]] [[spoiler:pig]] caused [[spoiler:[[TheHeart Elizabeth]] to unleash her hidden powers, healing everyone and damaging him]]. And then the main character in a last ditch effort to defeat him, attacks him, while everyone else fires their most powerful attacks on both of them. Hendrickson thought, that he just tried to give the others a chance to beat him, by sacrificing himself -- [[spoiler:and then he revealed a secret technique, that allowed him to collect damage from all these attacks and then release all that on him]].

* ''LightNovel/ACertainMagicalIndex'':

* ''LightNovel/FateZero'':

* Kyon of ''LightNovel/HaruhiSuzumiya'' gets a note asking him to meet in the classroom after school. He's pretty sure it isn't any of the SOS members, but he thinks a little about how he'll respond to each of them, if it is one of them after all. He knows that he does not know who it is. However, it was not possible for him to know that [[spoiler:Ryoko Asakura was actually an alien waiting there to murder him]]. He got hit with this trope, and it was not fun. At least, not for him -- for the audience, it was ''freaking awesome''.

* ''LightNovel/{{Overlord|2012}}'':

* ''LightNovel/SwordArtOnline'':

* In ''Manga/{{Naruto}}'', Kisame Hoshigaki probably shouldn't have stopped to KickTheDog after subduing Killer Bee- but who could have expected that [[spoiler:he'd be betrayed by his own EmpathicWeapon, leading to his defeat and death when reinforcements arrive]]? Certainly not [[AssPull the readers]], that's for sure... ([[spoiler:Actually, he ''did'' see it coming, since his "death" was a KansasCityShuffle to infiltrate the Cloud Village.]])
** [[spoiler:What he ''did'' fail to see coming was that Naruto would be able to detect ''murderous intention'', leading to his actual death.]]
** In the first movie ''Ninja Clash in the Snow'', the evil ruler of Snow Country is trying to activate a machine that his peace-loving brother (who he overthrew) created under the assumption that it's a [[LogicalFallacies superweapon]]. The machine turned out to be [[spoiler:a system of mirrors designed to warm the country and trigger spring]].

*** In revenge for Kiritsugu's attack, Kayneth attacks him in the Einzbern Castle and runs head first in another False Assumption ''and'' an Unknown Unknown. The False Assumption is that his last Mystic Code could easily defend him from mundane weapons, but while Volumen Hydrargyrum can easily repel the pellets from Claymore Mines and the fire of a Calico M950 it has to concentrate to defend from the point blank fire of a [[HandCannon Thompson Contender chambered for .30-06 rounds]], and he survived with a wound only because the Contender is single shot. The Unknown Unknown happens when Kiritsugu returns with the Contender: this time Kayneth concentrates his defense and reinforces it with prana, [[JustAsPlanned not knowing it was exactly what Kiritsugu needed for his]] [[DepletedPhlebotinumShells Origin bullet]] to ''completely and irreversibly destroy Kayneth's ability to use magic'', nearly killing him through the sheer pain and leaving him paraplegic as a side effect;

** [[spoiler:And speaking of Princess Kaguya, in the final battle against her, she proclaims that as the creator of Chakra, [[TemptingFate there is no Chakra-based technique they can use against her that she cannot immediately nullify]]. In response, and in desperation due to being completely out of other options, Naruto hatches a plan, and asks Sasuke if they can do...''"THAT technique"'', Sasuke begrudgingly agrees. They rush in, and Kaguya prepares herself for their attack, only to be hit with...''The Reverse Harem Jutsu.'' With Sasuke and Naruto using shadow clones to turn into a harem of naked, beautiful {{Bishonen}} boys surrounding her. '''''[[CrazyEnoughToWork This actually works.]]''''' Kaguya was so unprepared and unexpectant of this technique, that she's left in utter stunned shock, only able to barely mutter out a ''"...Huh...?"'' in response; then Naruto and Sasuke break the Jutsu, and nail the first solid and square hit against her in the whole fight.]]

*** In revenge for Kiritsugu's attack, Kayneth attacks him in the Einzbern Castle and runs head first in another False Assumption ''and'' an Unknown Unknown. The False Assumption is that his last Mystic Code could easily defend him from mundane weapons, but while Volumen Hydragyum can easily repel the pellets from Claymore Mines and the fire of a Calico M950 it has to concentrate to defend from the point blank fire of a [[HandCannon Thompson Contender chambered for .30-06 rounds]], and he survived with a wound only because the Contender is single shot. The Unknown Unknown happens when Kiritsugu returns with the Contender: this time Kayneth concentrates his defense and reinforces it with prana, [[JustAsPlanned not knowing it was exactly what Kiritsugu needed for his]] [[DepletedPhlebotinumShells Origin bullet]] to ''completely and irreversibly destroy Kayneth's ability to use magic'', nearly killing him through the sheer pain and leaving him paraplegic as a side effect;

* In the final battle of the first season, Hendrickson from ''Manga/TheSevenDeadlySins'' in the final battle was hit with three of them in the row. First [[spoiler:the hero's [[TalkingAnimal talking]] [[TeamPet pig]] ]] jumped in front of his sure-to-kill attack, saving the main character. Then, [[BerserkButton the death of the]] [[spoiler:pig]] caused [[spoiler:[[TheChick Elizabeth]] to unleash her hidden powers, healing everyone and damaging him]]. And then the main character in a last ditch effort to defeat him, attacks him, while everyone else fires their most powerful attacks on both of them. Hendrickson thought, that he just tried to give the others a chance to beat him, by sacrificing himself -- [[spoiler:and then he revealed a secret technique, that allowed him to collect damage from all these attacks and then release all that on him]].

* ''Manga/Overlord2012'':

:: Ainz shows up with half a thousand Death Knights mounted on Soul Eaters, a single one of either is already a threat requiring an army to take out. He then obligingly casts Dark Young, a spell that not only eradicates a third of the Kingdom's army, it uses those deaths to summon a quintet of {{Eldritch Abomination}}s that continue stomping the rest of the army flat. By the end of the battle, Ainz has nearly wiped out the Kingdom's army, while the only Imperial casualties came from trying to flee Ainz' monsters.\\
Jircniv is horrified at the spell's power, and while other powers are equally afraid, ''they think Jircniv did it knowingly'' (especially galling because Jircniv's strategy up to then was to slowly bleed the Kingdom of competent warriors with one battle per year), and now view him with distrust.\\
Ainz later participates in an arena tournament where he's agreed not to use any magic. Jircniv puts all his hopes on the arena champion (a war troll) killing Ainz, but Ainz still wins handily. This is the final straw for Jircniv (whose sanity was already eroding due to Ainz having him watched [[spoiler:to see how a ruler should behave]]), and he makes himself and his Empire a vassal of Ainz' fortress of Nazarick.\\
This leads to [[spoiler:a vast improvement in Jircniv's mental health]], as the only demands Ainz makes of him are to let Nazarick's inexhaustible undead forces defend the Empire's borders, to send all condemned prisoners to Nazarick for execution (and they ''send back'' those who were actually innocent), and generally promote tolerance of nonhuman races. As a bonus, Ainz takes no interest in running the Empire personally, allowing Jircniv to continue his reforms, and anytime someone complains about it he now has the option of telling them to take it up with Nazarick.

*** In revenge for Kiritsugu's attack, Kayneth attacks him in the Einzbern Castle and runs head first in another False Assumption ''and'' an Unknown Unknown. The False Assumption is that his last Mystic Code could easily defend him from mundane weapons, but while Volumen Hydragyum can easily repel the pellets from Claymore Mines and the fire of a [[RareGuns Calico M950]] it has to concentrate to defend from the point blank fire of a [[HandCannon Thompson Contender chambered for .30-06 rounds]], and he survived with a wound only because the Contender is single shot. The Unknown Unknown happens when Kiritsugu returns with the Contender: this time Kayneth concentrates his defense and reinforces it with prana, [[JustAsPlanned not knowing it was exactly what Kiritsugu needed for his]] [[DepletedPhlebotinumShells Origin bullet]] to ''completely and irreversibly destroy Kayneth's ability to use magic'', nearly killing him through the sheer pain and leaving him paraplegic as a side effect;

** [[spoiler:Kurt Godel's]] plan to make Negi an ally was screwed up because [[spoiler:he was totally unaware that Negi had a source of information that that Kurt couldn't have possibly have anticipated]].

** Ainz gives Enri a VendorTrash-tier item to defend herself, which summons a BadassCrew of goblins to her aid. When an army shows up to raze her village, [[https://www.youtube.com/watch?v=7L8uINAprnE she uses it again...]] and has unknowingly fulfilled several conditions to increase the item's power, meaning it now summons an entire goblin army 5000 men strong, complete with cavalry, heavy infantry, medics, assassins, artillery mages, and a strategist dressed as Zhuge Liang. Ainz' (who is watching through a MagicMirror) BigWhat of surprise can be heard from outside his tent, and he's forced to claim he'd intended for the item to do that all along.

*** After surviving Kiritsugu thanks to Lancer, Kayneth runs into an Unknown Known: his fiancee Sola-Ui is [[MadLove madly]] [[{{Yandere}} in]] {{love|MakesYouCrazy}} with Lancer, and tortures the now-defenceless Kayneth to get the Command Seals. He could have avoided the torture and having to give up the Seals by calling Lancer with a Command Seal, but his False Assumption that Lancer was willing to betray him prevented him from it. These would both fall under Unknown Known errors if he'd bothered to read up on the myths regarding his own servant, Diarmuid Ua Duibhne. Sola-Ui falls prey to Lancer's [[LovePotion Cursed]] BeautyMark (actually implied to be MoreThanMindControl), as his future queen did in the myth. And she forced him to betray his lord with magic.

** Luffy's "execution" (actually an attempted murder) in Loguetown is prevented when the executioner is struck by a bolt of lightning. Luffy's flabbergasted allies can only conclude it was DivineIntervention. However, they were atop a tall tower, the executioner wielding a metal sword, while ''[[WhatAnIdiot thunder was rumbling in the background]]''. [[spoiler:Although it is well implied that it wasn't natural lightning that struck.]]

* In the final battle of the first season, Hendrickson from ''Manga/TheSevenDeadlySins'' in the final battle was hit with three of them in the row. First [[spoiler:the hero's [[TalkingAnimal talking]] [[TeamPet pig]] ]] jumped in front of his sure-to-kill attack, saving the main character. Then, [[BerserkButton the death of the]] [[spoiler:pig]] caused [[spoiler:[[TheChick Elizabeth]] to unleash her hidden powers, healing everyone and damaging him]]. And then the main character in a last ditch effort to defeat him, attacks him, while everyone else fires their most powerful attacks on both of them. Hendrickson thought, that he just tried to give the others a chance to beat him, by sacrificing himself - [[spoiler:and then he revealed a secret technique, that allowed him to collect damage from all these attacks and then release all that on him]].

* In ''LightNovel/ACertainScientificRailgun'', Kousaku Mitori was blindsided twice over in her fight against Shirai Kuroko.
** First, [[spoiler:Mitori believed that her [[PowersDoTheFighting Liquid Shadow]] had killed Kuroko, only to find that the camera she was using to observe the fight had been fed false footage courtesy of Uiharu Kazari.]]
** Then, [[spoiler:Mitori thought she had prepared for if Kuroko found her by hiding in the sewer. She thought the first knife she threw would be dodged by Kuroko teleporting, which only gave her a limited number of locations she could use in the sewer tunnels, thereby allowing Mitori to kill her with her second knife. What she didn't expect was for Kuroko to simply let the knife impale her hand so she could get close enough to punch Mitori.]]