"You must excuse Wimp Lo... he is an idiot. We have purposely trained him wrong, as a joke."Alice has asked Bob to help her learn about a certain thing (for example, how to drive, since she's never bothered to learn). Or, maybe Bob has been assigned to act as a mentor of sorts at the workplace, since Alice is new there. However, rather than teach her properly, Bob decides to teach her all the wrong things. (This trope assumes that Bob is doing it on purpose; cases where Bob is making a sincere but incompetent effort don't count.) The reasons for this vary. Perhaps Bob doesn't want Alice to pass her driving test; maybe he's afraid Alice will outshine him at work, so he tries to get her fired; perhaps Bob's having fun at her expense; or maybe Bob's just an asshole. Whatever happens, you can be sure hilarity will ensue. Invariably, in comedic shows Rule of Funny dictates the sabotutor suffers from Laser-Guided Karma, most commonly being that their attempts to sabotage what they taught wind up impressing the ones calling the shots, netting them praise. Alternatively if the sabotage was to steal a role and the sabotutor succeeds, it'll turn out they just saved their unaware charge from an absolutely hellish experience. This doesn't have to just be a tutor in the academic sense, but any time somebody is instructing another person in a subject. If it fails, may lead to Springtime for Hitler. Compare Faux to Guide.
— Master Tang, Kung Pow! Enter the Fist
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Anime and Manga
- When Amelia asks Lina to teach her the Dragon Slave in a season one episode of Slayers, Lina deliberately puts her through a pointless Training from Hell that has absolutely nothing to do with magic in the hopes that Amelia will give up and go away.
- In Welcome to the N.H.K., Misaki's stated goal for Sato is to help him overcome his hikikomori tendencies and become a functional member of society. In truth, she wants to make Sato dependent on her, so as to assuage her own feelings of worthlessness.
- This is a common plot device used in Naruto fanfiction. Naruto's lack of skills are often attributed to his teachers deliberately sabotaging his ninja training. This provides a convenient way for authors to explain his rapid growth in power once he begins learning things correctly.
- In the First Try Series, Naruto and many other Academy students were sabotaged by Academy teachers as part of large-scale plan to weaken Konoha.
- Guru of Dragon Ball Z Abridged encourages Nail to stand up to Freeza by telling him that he's a champion of the old ways. After he leaves, Guru comments that if he'd taught him in the new ways, he might have stood a chance.
- The above-mentioned Wimp Lo from Kung Pow! Enter the Fist is a result of this.
Wimp Lo: "I am bleeding! Making ME the victor!"
- This was apparently an actual practice for certain schools.
- Twice in My Big Fat Greek Wedding. Ian asks Toula's brother Nick how to say thank you in Greek and Nick teaches him to say "Nice tits" instead. Later, Nick offers to teach Ian how to call everyone inside for dinner in Greek, but Ian has wised up slightly and asks for a second opinion. Unfortunately, the person he asks is Nick's cousin Angelo, who is in on the prank and confirms what Nick said, causing Ian to announce "I have three testicles!" to the entire Portokalos clan.
- Dogtooth: The father and mother of the main characters purposefully teaches them incorrect definitions to words in order to manipulate their world view and prevent them from ever learning certain concepts.
- Harry Potter suspects Snape of this when Snape teaches him Occlumency. He was wrong: turns out Harry's just really bad at Occlumency. Not that it makes Snape any less of a lousy teacher. The same applies to Potions, as Harry notes in the Half-Blood Prince that he finds Potions easier because Snape isn't shadowing over them like a bat, ready to bite their heads off over all small mistakes while he's insulting them.
- In Captain Corelli's Mandolin, Corelli wants to get on with the people whose village his men are occupying, so he asks an Italian-speaking local to teach him how to greet the villagers in their own language. The "greeting" he gets taught is thoroughly impolite, and causes him to become even less popular.
- In Warrior Cats, Lionblaze claims that Ashfur (who has a grudge against Lionblaze's parents, as he was part of a Love Triangle involving them) has been teaching him to do everything the wrong way. Brambleclaw (Lionblaze's father), is shocked at the accusation because he knows it could possibly be true, but he also scolds Lionblaze for blaming others.
- There's a whole series of humour books called "Great Lies To Tell Small Kids".
- In the first book of the Darth Bane series, the Brotherhood's lightsaber instructor always warned his students that Dual Wielding lightsabers was Awesome, but Impractical. When Bane duels him later in the book, the instructor suddenly starts dual wielding lightsabers. Bane realizes the real reason for the instructor's "warnings".
- In the The Witcher short story "The Last Wish", Geralt recites what he was taught was a multipurpose exorcism. It turns out to be a translation of "go and fuck yourself". The Literal Genie he used it on is very angry.
Live Action TV
- In one episode of I Love Lucy, Lucy and Ethel wanted Fred and Ricky to teach them how to play golf so they could spend more time together as couples. The boys, not wanting their wives to intrude on their one activity away from home, teach the girls ridiculously made up and complicated golf rules in hopes of making them hate the game and leave them alone. When the girls find out, they get the last laugh by convincing a professional golfer to play with Fred and Ricky using the made-up rules, tricking the boys into thinking they'd been playing the game wrong this whole time.
- In Grounded For Life, Sean deliberately "torpedoes" Lily when teaching her how to drive.
The Todd: ¡Mucho herpes! ¡Grande!
- In one episode, Dr. Cox has a German patient and (insultingly) asks Elliot to teach him to say, "You have fluid in your lungs" in German. Instead, she teaches him to say, "Your wife has nice cans."
- At Turk and Carla's wedding rehearsal, Carla's brother Marco gives The Todd a pickup line to use on their Spanish-speaking relatives: "I have genital herpes...for you!"
- On Married... with Children, Bud did this to Kelly, mainly just 'cause it was funny.
- An indirect version of this occurs in the "Dirty Hungarian Phrasebook" sketch in Monty Python's Flying Circus. Someone deliberately publishes a book with wildly inappropriate English translations of Hungarian phrases to get the user in trouble. It's the trope namer for My Hovercraft Is Full of Eels.
- That '70s Show: Fez and Kelso were prone to this.
Kelso: *faking a career day report* Autumn is harvest time for the farmer. At dawn, my dad and I were out in the fields, picking carrots fresh off the trees.
- Frasier asks Lowell to translate a speech he wants to give his son at his Bar Mitzvah into Hebrew, but having failed to complete the favor Lowell asks in return, Lowell translates it into Klingon instead. Hilarity ensues.
- Friends: Joey once taught a soap-opera acting class. One student asked Joey to coach him and prepare him for an audition for the role of a boxer, a role which Joey wanted as well. Joey advised him to play the role "homosexually". It backfired, though, because it turned out that they loved it and the student got the role.
- In one episode of Everybody Loves Raymond, Debra asks Marie to teach her how to make meatballs. Marie, fearing that losing her domestic edge on Debra will mean no one wants anything to do with her, switches the labels on the ingredients around substituting tarragon, a strongly bitter flavoured herb, for the recipe-appropriate basil.
- In 30 Rock, it's revealed that Drew was taught absolutely everything that way. He was just too handsome for anyone to ever tell him when he was doing it wrong. As a result, he believes you can cook salmon in Gatorade.
- On iCarly, Carly and Sam are dealing with the problem of tutoring a bratty kid. They teach him incorrect mathematics using nonexistent numbers, and he believes them and fails his class.
- Extr@ always features Nic, a native speaker of the language the series is in, teaching Sam, an American with little knowledge of the foreign language, all the wrong words, e.g. teaching "basket" as "oven" so that Sam will shock everyone by saying "the dog is in the oven". Nic does this to make Sam seem stupid and prevent Sasha (who Nic has a crush on) from liking him.
- On Family Matters, Steve Urkel once considered sabotaging someone in this way, because he saw the guy as a rival for Laura's affections. His better angels convinced him not to do it though.
- In The Big Bang Theory, when Stuart is briefly dating Penny, he goes to Leonard for romantic advice. Leonard deliberately feeds him wrong or misleading advice as he has a vested interest in breaking them up. Stuart later tells Leonard that Penny was pleased with his behavior.
- Peanuts - After Linus was born, and he was still younger than the other characters, Lucy decided to take him under her wing and teach him Little Known Facts. Lucy may just have been a Know-Nothing Know-It-All, though.
Lucy: This is an elm tree. Someday it will grow into a mighty oak. You can tell how old it is by counting the leaves.
- A Running Gag on FoxTrot whenever Jason does anything related to tutoring. One of the few times he didn't do this was when Paige decided to pay Jason in function of her grade.
- At least two times in Tank McNamara, a veteran football player is instructing a novice who's expected to replace him ... and advises the youngster to make a racist remark. "All the black defensive linemen think it's a barrel of laffs."
- In one Dilbert strip, the Pointy-Haired-Boss reviews a trainee's work performance and concludes that his trainer has been playing a six month-long practical joke on him. For some strange reason, the trainee doesn't find it funny.
Trainer: Sometimes there's a fine line between criminally abusive behavior and fun.
- In Teenagers from Outer Space, human characters have the ability "Fake Out", representing their ability to convince an alien visitor of almost anything regarding Earth culture, customs, and what is cool, since after all a human would be an expert on the subject. (The attempt succeeds on a d6 roll of three or higher.) Teaching them wildly inappropriate things is the most common practice. (Although telling the hot alien babe you want to date that kissing is a standard form of casual greeting will backfire horribly, because she'll greet everyone that way.)
- Played as a dramatic plot twist in Jade Empire. It is revealed that your master deliberately built in weaknesses into your fighting style, so that he could take you down after revealing that his name, Sun Li The Glorious Strategist was well-earned. The weakness is mentioned repeatedly by various masters, one even suggesting that your technique seems as if it tricks opponents into seeing an opening that isn't there. It was specifically designed by Sun Li in such a way that only he can take advantage of it and no one else.
- From the Street Fighter mythos: While training Dan, Gouken asks him his reason for taking up martial arts. When Dan tells him that it is so he can kill Sagat to avenge his father's death, Gouken lied and told him that his training is complete. Dan believes that there is nothing left for him to learn when in fact he is very lacking in technique.
- Professor Steve pulls this off in the Professor Brothers short The Substitute.
- The Zompist phrasebook is mostly correct, except for some translations that are fake. Especially, but not limited to, the directions.
- Skippy's List: 123: I should not teach other soldiers to say offensive and crude things in Albanian, under the guise of teaching them how to say potentially useful phrases.
- This shining example from Bash.org.
- In an episode of The Simpsons, Lisa, jealous of Maggie's recently discovered abnormally high IQ, attempts to put her wrong by teaching her the flashcard "Octogenarian" actually refers to the dog.
- On King of the Hill, Peggy pulls this on Lucky when he asks her to help him get his GED so he can propose to Luanne. She's hoping they'll break up instead.
- Discussed in one of the most memorable scenes of Ben 10:
Gwen: You trust me to help kick alien butt — why won't you trust me to teach you how to dance?Ben: 'Cause you're probably just gonna trick me into looking like some dancing doofus.Gwen: You don't need my help to dance like a doofus. So get over yourself! And give me your hands...
- In early outlines for Avatar: The Last Airbender, Iroh was this to Zuko, under orders from Fire Lord Ozai. By the end of the first season, though, his personality became more well-defined.
- In The Cleveland Show episode "Brotherly Love", Rallo gives Cleveland Jr. dating advice. After Rallo falls for the girl, his advice includes being on the phone all the time because it makes you look important and try to solve a problem immediately without hearing all the details. He also says that if she has anything to say, take a long exhale, roll your eyes, and say "what".
- In an episode of SpongeBob SquarePants, Spongbob beats out Squidward for a role in a dance because it turns out to be a natural talent. Squidward, envious of this, decides to "take Spongebob under my wing" and proceeds to train him to exhaustion and show up to steal his role. then it turns out that it's Squilliam's play, who proceeds to berate and work Squidward just like he did Spongebob.
- Most Popular Chinese Tattoo Symbols. Totally not a prank.
- A Brief Synopsis of The Lord of the Rings Subtitled "Your homework done for free!" and you get what you paid for. Notable for having fooled a London Sunday Times reporter.
- Has been known to happen with American POWs during the Cold War being forced to teach enemy spies about how to pass as an American. For example, they might say to NVA agents that the Dead Man's Hand in poker is two pair, kings and jacks (it's aces and eights).
- This is a common retaliation against bullies and cheaters on notalwayslearning.com. Here are examples.
- Exlporers in Alaska asked the wrong people what to refer to the Inuit tribes. Instead of asking the fishing-based Inuits directly, they asked land-based hunters, who were enemies of the Inuits. Naturally, these hunters told the explorers they were the "Eskimo," a derogatory term referring to someone who eats too much fish and smells like them.