In Transformers Meta, Barricade had successfully deduced that Bumblebee had been trying to trick him into letting him go by lying about finding mermaids which would grant him wishes, but still fully believed that mermaids were real and declared he would "find them by himself."
He proceeded to list the things he would wish for upon his success.
Skeleton: WHAT IS THE WIND SPEED OF A SWELLOW? Phanphy: Wait! I saw this on TV once! I know the answer! Is it a Hoennese Swellow or an Orrean Swellow? Skeleton: HOENNESE. Phanphy: No, you were supposed to say you didn't know, then fall off a cliff. Skeleton: YOU WATCH TOO MUCH TV.
In the Naruto fic "A Few Angry Words" Pain seems to think he's Julius Caesar marching into Rome. He's more like the Antichrist marching into the Jezreel Valley.
It's still not entirely certain who's rightGenre Savvy in Harry Potter and the Methods of Rationality, but we know Draco isn't the Chessmaster he thinks he is, and Hermione does not in fact seem to be in a romantic comedy. Smart money's on Dumbledore's being wrong that it's a fantasy, and Harry may not actually be right that it's sci-fi (at least not the sort of sci-fi he thinks it is.)
We Just Want to Help You by Jeanne Hedge is a fic where a random fan of Bubblegum Crisis finds herself in the Tokyo of 2035, hurries over to offer to help Ms. Stingray... and gets tranqed and sent to the loony bin when it turns out she's not actually inBubblegum Crisis, but a relatively close (but significantly divergent) Alternate Dimension.
Later on, the crew goes to help a village that is being attacked by amoral mercenaries. The entire scenario seems like a classic Western tale where the heroes protect the helpless against an enemy with overwhelming firepower. In reality, they're in a psychic horror story involving a Town with a Dark Secret where everyone is being mind-controlled by an unstable telepath.
In With Strings Attached, in the second part of the Vasyn quest, the four find themselves in what they think is a hollow world/spaceship a la ï¿½For the World Is Hollow and I Have Touched the Sky.ï¿½ Given what they've already been through, this doesn't scare them, and they figure they know how to proceed. And then they find out they've actually been shrunk and put into a science experiment in someone's basement. That scares them.
Team 9 is full of idiots, though, and they are also misinformed about what is actually going on. Yukari, though, has no excuse, as she seems convinced, against all evidence, that she actually can take on Rin Satsuki, who already defeated her, Reimu, Eirin and some of Gensokyo's other powerhouses and possesses the power of a freakin' ARCHANGEL OF DEATH. Oh, and she apparently doesn't have any problems in trying to screw things over while she already has to deal with Yuuka, who placed a bounty on Rin Satsuki's head. If she had actually spent TWO SECONDS listening to what Eirin said, or, failing even that, had tried to find a peaceful solution, she wouldn't have ended playing Yuuka's game. If Rin actually WAS the Omnicidal Maniac she believes her to be, Gensokyo would have been ANNHILATED by now.
In Ultimate Sleepwalker: The New Dreams, the Ax-CrazyPsycho for Hire Bullseye revels in his supposed A-list status and looks down on C-List Fodder like the billiards-based 8-Ball. When they're hired by rival crime bosses who are fighting a Mob War, Bullseye and 8-Ball end up fighting. The cocky Bullseye thinks that, as the A-lister, he'll have an easy time against the C-list 8-Ball. However, Bullseye ends up impaled by a huge piece of metal and gets his head severed and knocked into a garbage can by 8-Ball, just to add insult to injury.
In Game Theory, Nanoha seems to think that she's in a standard magical girl show, that she can win fights by implementing crazy plans and improvising new spells without understanding how the magic works, and that it's okay to risk putting a lot of people in danger for the sake of one person.. Thisisnotthecase.
In the Ben 10Fan FicHero High series, Ben seems to think of himself as a comic book hero who will defeat the bad guy and save the world. Instead he helps the bad guy to save the world and said guy gets off Scott free from his crimes. Also many of the Original Characters seemed to be driven to show Ben that he has a case of Wrong Genre Savvy.
In the A Certain Magical Index fic Wintertime, when Kagun Kihara accidentally walks in on Marian Slingeneyer bathing in a lake, he steals her clothes, thinking this will give him power over her. She coldly informs him that she is a Dvergr, not a swan maiden or selkie. He was lucky she decided not to kill him.
In Perfection Is Overrated, Midori, like in Mai Hime, realizes that the conflict the Himes are involved with is not quite like the animes she's used to, although she learns to adjust, and mostly keeps her team together. The SUEs are largely driven by the belief that everything will go their way just like in fics in which they are the main character, not realizing that their actions are considered unreasonable and immoral by most people's standards, or that they will lead to their downfall.
Kyoko in the Puella Magi Madoka MagicaFan FicHave Your Cake And Eat It, after dying and going to the the afterlife for magical girls created by Madoka, quickly assumes that, given her past experiences, if something seems too good to be true, than it probably is. Except in this case she's wrong.
In Hivefled, Lereal thinks that when Karkat and the trolls arrive, it's a clear sign that since the descendants of major rebels have arrived, it's time to take on the oppressors. And to be fair, there are a lot of stories where that would be true, but unfortunately, Lereal hasn't realised that it's not his story, it's Gamzee's, and the Sufferist rebellion is merely a backdrop- and so when Lereal takes the cultists to rise up against the oppressors, they all get slaughtered horribly, excepting one ship of mutineers and Karkat's ship.