You have a friend, who has never actually done whatever task you need to do, but hey, they have read all about the subject so they are going to attempt it anyway. What Could Possibly Go Wrong?... right?
This trope is the literary equivalent of I Know Mortal Kombat and Taught by Television — that is, the character in question gets their knowledge by reading about it. A character with only book knowledge of a subject may be the Closest Thing We Got in an emergency situation. Contrast Taught by Experience, where a person lacks formal knowledge but dives in headfirst into the thing to be learned.
- "I'm not a doctor, but I play one on TV."
- Similar to this is a hotel series, where someone steps up to a problem, is asked if they're an X, and replies "No, but I stayed at a Holiday Inn Express last night."
- Battle Royale uses this for two of Kazuo Kiriyama's Crowing Moments Of Awesome, both in Flashback. The first has him breaking the arms, nose, and jaw of a bunch of bullies, with the explanation that "I simply used the information I learned from this book" * shows a human anatomy text* . The second has a mean judo coach with a penchant for humiliating his students pick Kiriyama, reading a book in back, for the next spar. Kiriyama closes his book with the title facing the reader: "Introduction to Judo".
- When Gohan of Dragon Ball Z has to play baseball in high school, he notes that he has read about it after admitting that he never played it before. Of course, being a superhuman half-alien who spent a sizable portion of his life in Training from Hell, any physical activity is pretty much a cakewalk for him, once he understands what he's supposed to be doing.
- Eyeshield 21: The Amino Cyborgs team do only a middling amount of training, and spend more time getting juiced up and reading books on how to play football. This leaves them with low stamina and a poor grasp of football fundamentals when they play the Devil Bats.
- Yuu from Holyland first learnt boxing from a book. As this manga has a very realistic slant, he trained a lot before even thinking to use the most basic moves.
- In Noir, the Action Girl Kirika reads a book on making tea and henceforth enjoys it to no end. Which is kinda cute, once you consider that making tea is the only thing she can do well besides killing people, and the only thing she ever learned on her own.
- Max from Pokémon the Series: Ruby and Sapphire is a bit of a Know-Nothing Know-It-All — he actually knows a lot of Pokémon facts and statistics from reading about them, but his total lack of battle experience means that he gets his butt kicked when he tries to conduct an actual battle.
- In Pokémon Adventures, the main reason Platinum went on her journey was to try out first-hand the many things she read about. That said, sometimes she initially sucks at whatever she's trying out even when she recites whatever the book told her on the subject, like when she kept falling down when she was on a bike for the first time in her life.
- During sports day in Don't Become an Otaku, Shinozaki-san!, Kaede thinks she can play baseball after reading manga about it. She quickly gets beaned in the head by a fly ball.
- In Zom 100: Bucket List of the Dead, Shizuka is an avid reader and wanted to become a doctor ever since she was a child. Although she has no formal medical training, she's able to diagnose and treat the various ailments of Gunma's elderly, for which they're so thankful for that they rush to her aid when she's in trouble. She's also able to use some aikido against a zombie after reading a book about it.
- This was the shtick of the Golden Age DC Comics character Genius Jones (created by Alfred Bester). Jones was stranded on a desert island with 734 books. He read all of the books and memorised all of the information in them, before eventually setting fire to them to attract the attention of a passing ship. Once back in civilisation he sets himself up as the Answer Man, a costumed hero who answered questions and solved crimes for one dime, using the information he had gained from the books.
- Literally the power of the Marvel superhero called Gwenpool. Or at least one of them. She has read many of the comic books starring the characters she is now physically interacting with. She gains a momentary advantage over the current Thor by shouting out her real name.
- In A Delicate Balance, Twilight Sparkle's attempt to ask Applejack out is informed by copious amounts of How-To-Pick-Up-Girls style advice books. It goes about as well as one would expect.
- Twilight Sparkle finds out that this also applies to magical combat in Duel Nature.
- DJ Croft of Neon Exodus Evangelion is suspiciously good at sex, considering he's supposedly a virgin — he learned the how-to from a book and filled in the gaps with just-that-awesomeness.
- Ume from Sugar Plums uses this as an excuse for the skills she learned from her previous life. She's called out on it at least twice by another character, though the second time she actually throws a user manual at the character to explain that she did indeed read a book about what she was going to do.
- In The Flash Sentry Chronicles, Rarity claims to be an expert on romance due to having read many romance novels, and explains to Twilight everything someone does on a date when helping her prepare for her first official date with Flash. Though Fluttershy questions this, pointing out Rarity has never actually been on a date herself before.
- Aliens. Gorman's only been on two real drops. Counting this one.
- American Beauty. The 14-year old isn't the slut she makes herself out to be.
- Anthony Hopkins plays a millionaire publisher in The Edge. He knows all about survival, but only from books, and finds himself having to put his theoretical knowledge to use when his plane crashes in the woods. It serves him surprisingly well.
- The climax of Executive Decision involves two of the protagonists having to land a Boeing 747 after the pilots are killed by terrorists. One of them has incomplete private pilot training, and they rely on the aircraft's manual to run through the process of landing the aircraft. Incidentally, such manuals being kept aboard planes is Truth in Television because modern aircraft are very complex, and experience has shown that forgetting a step either in flight or in maintenance can have disastrous consequences.
- The Reveal in The Flight of the Phoenix (1965) (movie and novel). Dorfmann doesn't actually design commercial aircraft, just scale models operated by remote control. However, the basic principles are the same, and he notes to Towns and Lew that there are extra challenges in designing model aircraft, as they have no pilots and so cannot rely on them for stability. Unfortunately he only mentions this (quite casually) the night before the plane they've constructed is due to fly; Towns and Lew naturally assume he's mad and only go ahead with the plan because they're run out of both water and other options.
- The Muppet Movie:
Kermit: Where did you learn to drive?
Fozzie: I took a Correspondence Course.
- In the first Short Circuit movie, Number 5 reads everything in Stephanie's house (including the entire encyclopedia) before his adventures. The next day he reads the User's Manual (Not Driver's Training) for Stephanie's van immediately before driving it.
- The difference, for those who don't themselves drive, is the the User's Manual usually kept in a vehicle is information about things like how to check and add oil, how to operate the air conditioning, where the seat postion controls are located,etc - not the rules of the road, which vary from state to state and country to country.
- A subversion in that he's still an abysmal driver, and nearly gets himself and Stephanie killed several times within a span of a couple minutes. Since he only knew how the car was supposed to work, and not the rules of driving, it's still this trope.
- In Teenage Mutant Ninja Turtles (2014), Master Splinter learned ninjutsu from a book he found, unlike in most continuities where he's either ninjutsu master Hamato Yoshi or his pet rat who picked up ninjutsu from watching his moves. Shredder lampshades this during his fight that it might not be the best way to learn. Of course, Splinter is still able to put up a good fight despite this.
- In Three Days of the Condor, based on the novel Six Days of the Condor, Joe Turner's job for the CIA is to read books, newspapers, and magazines from around the world, looking for hidden meanings and new ideas. When the Call to Adventure comes to him, he uses his book learning to survive.
- In Train of Life, the driver of the locomotive had to teach himself from a book. Actually, it works.
- Julius Benedict in Twins (1988) knew all about driving from reading about it, and having read the car's manual, he knew he could shut off the alarm by lifting it up from the back, thereby tricking it into thinking it was being towed. Of course it only worked because of his extraordinary strength.
- In Those Magnificent Men in Their Flying Machines, Colonel Manfred von Holstein attempts to teach himself how to fly by reading the official German army handbook on piloting; while he is flying. He does surprisingly well until he drops the book.
- Black Tide Rising: One short story from We Shall Rise has the survivors at a Catholic school depending on books from the school's library to guide them through their mechanical maintenance and gardening.
With a little help from one of the middle school girls, Emily fixed all things mechanical for us—as long as the thing that needed fixing had an owner's manual.
- Horatio Hornblower is constantly reinforcing his Badass Bookworm status by reading. That and the fact that he is very Good with Numbers. The Midshipman stories in particular often have young Hornblower comparing his new, actual experiences of sailing and war to what he's read about in books.
- In Wintersmith, Roland believes that he will be an expert swordsman because he has read the fencing manuals and fought many imaginary swordfights in his mind.
- The Rupert in Monstrous Regiment does the same thing. He actually cuts his own hand practicing out of a book.
- His sword hand, in fact. Do not ask how.
- King Verence and Queen Magrat order a lot of text books, too. Misreading the word "martial" makes for all sorts of fun.
- Don Quixote is a very old example; he read tons of books about knights and then thought he could be one.
- Scriber Jaqueramaphan from A Fire Upon the Deep by Vernor Vinge; he also tends to be pretty incompetent in most of the things he's read about. Terrifying the hell out of his friend when they're about to sneak through the army of a feared warlord; Scriber is a spy, and is therefore assumed to have experience in this until he says:
Jaqueramaphan: Don't worry. I've read all about doing this sort of thing!
- In Harry Potter, Dolores Umbridge states that just having a theoretical basis in Defense Against the Dark Arts should be enough to prepare the students to successfully take their exams. (In a subversion, though, the real reason for the dumbed-down, book-taught Defense Against the Dark Arts class is to ensure the students don't have any practical knowledge.)
- Hermione gets a few of these. Most of the time, it actually is enough.
- David from the novel version of Jumper when he finally loses his virginity. Millie asks if he's really a virgin, and he replies, "I told you, I read a lot." (It's a running gag, the "read a lot" thing).
- In Masked Dog by Raymond Obstfeld, the villain is a convicted criminal used to test an experimental drug which gives him Super-Strength and the ability to retain vast amounts of information. After using his skills to escape, he decides to become a master assassin, but while his new powers make him dangerous, his application is often flawed. For instance, he reads a book on lockpicking, but when trying to pick a lock, he loses patience and just smashes down the door.
- Twilight's Edward Cullen. While the rest of his family was having housebreaking sex, he was by his lonesome spending his sleepless nights studying everything there is to study. For example, he cooks perfect meals for Bella on his first try, despite never having a reason to cook before.
- He often Lampshades this fact when he talks about human emotions like jealousy and lust.
- In The Day of the Triffids by John Wyndham, a character known only as "the radio man" learns to fly a helicopter by reading books and practicing for half an hour.
He seemed to have complete confidence that his instinct for mechanism would not let him down.
- Thoroughly averted in The Lay of Paul Twister. Paul is from modern-day America, and he's stranded in a Standard Fantasy Setting. He's read books about a lot of things, but he only has about as much understanding of how modern technology works as any modern person would pick up from Popcultural Osmosis. So when he wants to get something new invented, he has to get some researchers and engineers who actually know what they're doing and point them in the right direction.
- In Wax and Wayne, when Waxillium started his career as a lawman, he was woefully naïve about how life in the Roughs actually worked and based all of his efforts on fictional novels he read about lawmen and outlaws. Lessie, a native to the Roughs, is rightfully exasperated by his belief in all of the clichés he takes at face value. Fortunately, he gets Taught by Experience and shapes up.
- The Scum Villain's Self-Saving System: Ren Zha Fanpai Zijiu Xitong: When he starts to fall for Su Xiyan, Tianlang-Jun asked Zhuzhi-Lang why she wasn't acting the same way as the blushing maidens in the books he read or the plays he saw, wondering if he didn't look handsome enough for her to act in that way.
- The Murderbot Diaries. When the eponymous Rogue Drone has to start acting as a 'security consultant' instead of a SecUnit it finds itself having to base a lot of its actions on the media it watches obsessively. This is because Murderbot had its memory wiped and so only remembers what happened since then, or if the appropriate information module has been downloaded into it. SecUnits are basically told what to do and seldom consulted even in their area of expertise, so things are different when Murderbot has to conduct investigations or tell Too Dumb to Live humans what they shouldn't do.
- Much to Myne's frustration in Ascendance of a Bookworm, just because you read a book that talked about how to do something is made doesn't mean you can do it yourself. Several of her attempts at making something to write on are eventually abandoned as being too impractical or because she knows too little about the process to actually succeed. Most explicitly, at one point she vaguely remembers something about papyrus being made of layered reeds or something and just has to try to make it based off that knowledge. She eventually gives up when it fails to meet her expectations, unsure as to whether she was doing it wrongnote or if it really is just that annoying. Another time she tries to make clay tablets, but they just explode when she tries to dry them in an oven.
- In the All in the Family episode "Edith Writes a Song," Mike tries to placate two African American burglars whom Archie has racially insulted, by explaining that Archie doesn't know what it's like to grow up in the inner city. One of the burglars responds, "Oh, and you do?" Mike sheepishly replies that he learned about it in his sociology course.
- The Big Bang Theory
- Sheldon Cooper attempted to learn to swim on the internet. And to rock climb. He's actually pretty good at the climbing. It's when he looks down that it all goes wrong. (He's afraid of heights).
- He also tries to find a book on how to make friends. All he can find is a children's book, Stu the Cockatoo is New at the Zoo, but he figures he can extrapolate the skills to fit his needs.
- Invoked unsuccessfully in A Bit of Fry and Laurie when they try to fly a plane with no experience, not even reading about it.
Hugh: Right now, Sir Peter, you've never flown an aeroplane before?
Stephen: Never flown in my life, Johnny, no.
Hugh: And you've never had any lessons?
Stephen: Oh, I've had lessons, maths, geography...
Hugh: But not in flying?
Hugh: And I've never flown before. Is this something you've always wanted to do?
Stephen: Not particularly. So, when you rang up, I just leapt at the chance.
- In Buffy the Vampire Slayer, Wesley bragged that in the new Watcher training, he had even taken on two vampires "under controlled circumstances, of course". Giles quickly countered that he wouldn't encounter those in Sunnydale... controlled circumstances, that is.
- Manuel in Fawlty Towers. "I speak English well. I learn it from a book."
- Parodied with Dave in Flight of the Conchords, who acts like an expert in all things, especially being a ladies' man. Judging by his tendency toward malapropisms and the way he (deniedly) lives with his parents...
Jemaine: You'd better watch out. Bret knows karate.
- Also taken to a logical extreme:
Bret: Yeah, I've got a book on karate. But I haven't actually read it yet.
- In House Season 4, one of the applicants for House's team is Henry Dobson, a doctor in his mid-sixties with an encyclopedic knowledge of medicine rivaling that of House himself. However, House gets suspicious when he notices that Dobson always delegates medical procedures, no matter how trivial, to junior doctors. House eventually discovers why: Dobson is not a real doctor, but rather a Columbia admissions officer who audited 30 years worth of medical school lectures. He could not perform basic procedures because he never got any hands-on experience.
- New Tricks: Dan Griffin is widely read and has a lot of esoteric knowledge. But this trope really comes into play when he demonstrates mad skills at five-a-side football despite never having seen a match. He explains that when he learned they were going to be playing, he read several books on the subjects and the rest was "basic physics". However, he does fall for an obvious feint, because he has no way of knowing what one is.
- Star Trek: Deep Space Nine. Quark trolls Odo with this in "Babel". He offers to use the transporter to get Odo onto a spacecraft, citing his service aboard a Ferengi freighter. Quark then says "I must have witnessed the procedure a hundred times!", enjoying the Oh, Crap! look on Odo's face as he dematerializes.
- Star Trek: Voyager, "Rise." When trying too hard to impress Tuvok, Neelix claims to know everything about orbital tethers (flexible columns going from a planet to an orbiting station, so you can take a Space Elevator to it). Tuvok is not impressed when Neelix eventually admits that he really only worked with models. Very detailed models as he's quick to claim, but still models. The practical knowledge he has is more than everyone else's put together, though—and it's enough to avert disaster.
- The X-Files: "I play Dungeons & Dragons. I know a thing or two about courage"
- Read About Love by Richard Thompson would be an inversion: the character portrayed has "read about love" and doesn't understand why he makes girls cry.
- Figures into the plot of "Counting Out Time" from the Genesis album The Lamb Lies Down on Broadway. The main protagonist, Rael, has read a book about erogenous zones, and he thinks that's all he needs to get his date to sleep with him. However, all he ends up getting is a slap.
- The Factotum class (dungeonscape) in Dungeons & Dragons has this as its premise. As a result, its class skills are "All", even obscure class-specific ones are treated as class skills for a factotum.
- This is actually a knack in Scion. Basically means that the Scion has read so much about stuff they can try them even if they have no training.
- Pretty much any CRPG will contain skill books for those all-important extra skill points.
- Book of Hours: The Librarian's main method of acquiring and gaining more understanding of skills as diverse as surgery or glassblowing to reading omens in the sky is... to read books about them. It is implied that practice is required to actually level up skills with the understanding you acquire by reading books, however.
- In Dragon Ball Online, Gohan writes a book called "Groundbreaking Science," which explains the concepts of ki control, helping Saiyan hybrids to learn how to fly/shoot ki blasts/etc by reading a book.
- The protagonist of Daughter for Dessert, in his flashback about hacking into Lainie’s family’s lawyer’s computer, says that he'd never hacked a computer before, but he’d read books about it to prepare.
- Averted with the protagonist of Melody. Every musical instrument he teaches Melody how to play (not just the “cool” ones that get played in rock bands), he has at least some experience playing himself.
- Jaiden Animations grew an obsession with birds through reading the Maximum Ride book series when she was in 6th grade, and never truly grew out of her bird phase, culminating in her eventually adopting her pet conure, Ari.
Jaiden: Everyone say a big thanks to James Patterson for creating this bird-obsessed monster.
- Fate/type Redline: When Tsukumo Fujimiya gets her fingers chopped off, Kanata Akagi surgically reattaches them. She asks how he did it with such skill, and he thinks to himself that he's lucky he reads Black Jack.
- A guard in Paris in Girl Genius seems to think that having read about Reverents will prepare him for a fight with a large group that's surfaced in Paris. An older veteran disagrees saying there's nothing which could prepare the uninitiated.
- Parodied in Family Guy:
Peter: I'll handle it, Lois, I read a book about this sort of thing once.
Brian: Are you sure it was a book? Are you sure it wasn't... nothing?
Peter: Oh yeah.
- My Little Pony: Friendship Is Magic, "Fall Weather Friends": Grade-A bookworm Twilight Sparkle enters a big marathon, the Running of the Leaves, alongside her more athletic friends Applejack and Rainbow Dash. The two of them scoff when Twilight claims she's read a book on running techniques in preparation for the race, but in the end she manages a respectable fifth place for a first time race by pacing herself, while Applejack and Rainbow Dash end up tied for dead last because the two of them were too preoccupied with making sure the other doesn't win.
- This is a large part of Twilight's personality. Between her being Obsessively Organized, checklists to track checking her checklists, and apparent access to L-Space to be able to find a book on anything anywhere. She has a rule book for a "goof-off", for example with Spike claiming that Twilight has a rule book for everything.
- Ted from Daria turns out to be good at a VR game because he read manuscripts on swordplay. It's almost the inverse of I Know Mortal Kombat.
- In one episode of TaleSpin, Baloo's pilot's license is suspended, so Rebecca keeps the business going by teaching herself to fly the Sea Duck from a book.
- Steven Universe: Peridot has only read up on a few hundred years worth of gem history reports on Earth (Gems as a species can be so old that the younger ones can fall under Time Abyss). Despite this, she didn't know there were still gems on the Earth other than The Cluster and its prototypes.
- Kipo and the Age of Wonderbeasts: Everything Kipo knows about the surface world comes from books that have been out of date for about 200 years and don't cover the hyper evolution that almost everything has undergone.
- The entire reason for the Dummies (Wiley), Complete Idiot's Guide (Alpha Books), Teach Yourself (Hodder & Stoughton), and Everything Guide (Adams Media) series' success, as well as websites like eHow and Howcast. Don't underestimate the value of practice though — "instinct" isn't.
- There was a parable in the Eighteenth century about the need for this in a military officer and the fact that street smarts aren't necessarily enough. It goes roughly like this, "There was a mule who served in the army for ten campaigns. At the end it was-a mule."
- But mules don't learn military tactics by experience on the battlefield; people do.
- For the matter of that, the mule probably did learn how to carry stuff around which is of course what mules are for.
- But mules don't learn military tactics by experience on the battlefield; people do.
- Subversion. According to C. S. Lewis in The Discarded Image (a series of lectures about the cultural background of Medieval literature) many medieval beliefs, even those that sound like holdovers from primeval superstition were in fact simply because somebody had read a book about them. Books were so expensive and such fine pieces of craftsmanship that no one could really quite make themselves believe that a book could actually be wrong.
- Among the many lesser-known things the U.S. government habitually does is pay for the creation of (often mind-numbingly) detailed publications and manuals on pretty much any random thing a citizen might need to know how to do. For example, cooking a turkey or safely cutting down an evergreen tree with a chainsaw. Said publications are cheaply (cost of printing and postage) or freely available, especially with the rise of the Internet, and there have been accounts of people (usually in the bureaucracy, who know about them and can find given topics) who learn skills mainly from these.
- Mary's Room is a philosophical thought experiment. Suppose Mary lives in a room where everything is black-and-white — the furniture, the books, the computer screen connected to the internet, everything she ever sees so that she has never seen color. However, she has access to and learns about everything that can ever be known about the physical properties of color: that they are slightly-different wavelengths of light interacting with different receptors within the human eyeball that transfer this information to the brain which interprets it and so on. If her monitor's black-and-white filter were to suddenly break and she sees, say, an apple in red color for the first time, would she learn anything new?
- One of the famous stunts by special forces commander Larry Dring during the Vietnam War was organizing a private 'invasion' of a beach where some VC would take occasional pot-shots at a passing Navy vessel. When hauled up before his CO to explain, Dring could only reply, "Well sir, I once saw a movie about World War 2." You can read the story here (Story #1, pages 6-8).