%% Image Pickin' conversation: http://tvtropes.org/pmwiki/posts.php?discussion=urtuljjxdxigvgs1uci804y9
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[[quoteright:330:[[ComicStrip/CalvinAndHobbes http://static.tvtropes.org/pmwiki/pub/images/know-nothing_hobbes_6207.jpg]]]]
[[caption-width-right:330:There ''[[RightForTheWrongReasons are]]'' imaginary numbers, just not [[EleventyZillion the ones he's thinking of]].]]

->''"Professing themselves to be wise, they became fools."''
-->-- '''[[Literature/TheBible Romans 1:22]]'''

A Know-Nothing Know-It-All is a character who insists he or she knows everything; is always right; that [[GladIThoughtOfIt they were the ''actual'' original creator of an idea]]; and who generally has an extremely high opinion of themselves and their abilities, when nothing could be further from the truth.

They are grossly misinformed, or just lying, about everything they talk about with authority. They create nothing new, and are IgnorantOfTheirOwnIgnorance. Their abilities could best be described as "scarce". Such people are, in fact, the living definition of the word charlatan.

While many characters show signs of being this, very few have it as a major facet of their character. For example, Peter Griffin of ''WesternAnimation/FamilyGuy'' tends to spew horribly misinformed information, but oddly enough, sometimes he's right, in the rather odd world the series is set in.

LittleKnownFacts are occasionally in the Know-Nothing's mental arsenal, thanks to their obtuse quality, but naturally, the research won't be. Hopefully, they're at least EntertaininglyWrong.

A RealLife engine driving this is the [[https://en.wikipedia.org/wiki/Dunning-Kruger_effect Dunning-Kruger effect]], where the less competent are paradoxically ''more'' likely to consider themselves good at a task (because they are equally incompetent at assessing their own performance at it).

Can sometimes intersect with the {{Jerkass}}. Compare TooCleverByHalf, which is when an actually smart person gets overconfident and makes a mistake they thought they were "too smart" to fall for. Propense to DelusionsOfEloquence, though not all of them have them. Compare FeigningIntelligence. Contrast InsufferableGenius, who has the same arrogant attitude but is ''not'' incompetent. Actually listening to one may result in TheBlindLeadingTheBlind. Compare SmallNameBigEgo, who both want to be recognized and appreciated, but take different paths to it. For a more "physical" version, see BoisterousWeakling.

[[JustForFun/IThoughtItMeant Has nothing to do]] with [[UsefulNotes/MillardFillmore a know-it-all]] from [[AtrociousAlias the Know-Nothing party]].



[[folder:Anime & Manga]]
* Autor from ''Anime/PrincessTutu'' fits this trope to a T...at least at first. He's an insufferable know-it-all who believes that he's a descendant of Drosselmeyer and also the absolute expert on the subject of his powers. He puts another character who wants to learn about his powers through a series of ridiculous 'training' exercises, including standing in the middle of a room for three days without eating or sleeping and only using "blue and black ink in a seven-to-three ratio". Eventually he's [[BreakTheHaughty humiliated]] when the character he's training proves to have much more power than him...if he ever had any power at all. In the end it's slightly subverted, however--the character he "trained" is forced to go back to him for help because he actually ''is'' one of the best experts on Drosselmeyer.
* In ''Webcomic/AxisPowersHetalia'', South Korea always claims he invented everything (well, almost everything. No one takes responsibility for condoms).
* Takashi Yamazaki from ''Manga/CardcaptorSakura'' is always making up lies he claims to be facts. Interestingly enough, while most know he's lying, both Sakura and Syaoran both tend to believe him at first, before Chiharu breaks it to them that they're being lied to and [[{{Tsundere}} lays the smackdown on Yamazaki]], though one or two times, he ''is'' right in his extravagant speeches.
%%* Onsokumaru in ''Manga/NininGaShinobuden''.
* Umino Gurio in ''Franchise/SailorMoon'', ''academically'' smart, just very lacking in common sense.
* Sakuragi Hanamichi from ''Manga/SlamDunk'' is actually pretty stupid but always goes around saying "Ore wa tensai!" (I am a genius) and "Ore wa tensai baskettoman!" (I am a genius basketball man)
* One episode of ''Anime/LupinIIIRedJacket'' featured Sherlock Holmes III among a group of detectives hired to outsmart Lupin. In the original version, he was a cultured gentleman. The Geneon GagDub turned him into a total nitwit who is always either stating the obvious or completely ignorant of the obvious -- for instance, upon noticing an opulent dining fork, he proclaims it "a dining implement of some kind; a bit showy, whatever it is." Granted, the Holmes seen for most of the episode is actually Lupin in disguise, and when the man himself gets a chance to talk he seems pretty on the ball.
* Saori Takebe in ''Anime/GirlsUndPanzer'' tells the girls on their Tankery team all about how to win over a guy. Then one of them innocently asks if she has a boyfriend, to which she becomes speechless, since she never had one in the first place. The girls try to cheer her up anyway.
* Sakura Haruno is a practical {{Deconstruction}} of this trope from ''Manga/{{Naruto}}''. While she was one of the top students of the Academy (second only to Ino who had became the Kunoichi of the Year), she considered herself a lot stronger than the 'Dead-Last' Naruto Uzumaki since she equated 'knowing more about textbook things translates to real life'. During her first ''real'' mission in the Land of Waves, she realized Naruto was not only stronger than her but had pulled far ahead and during the Chunin Exams, she sacrificed the long hair she had grown meticulously so Sasuke would notice her in an attempt to save her teammates who were unconscious from the battle with Orochimaru. Sakura eventually becomes [[LadyOfWar Tsunade]]'s apprentice, TakesALevelInBadass in the first arc of Part II...and then has no truly memorable fights afterwards, and is TheMedic on the sidelines at best. However, during the last stage of the WarArc [[spoiler: she can keep up with KCM Naruto ''and'' a Complete Susano'o EMS Sasuke...until she gets OvershadowedByAwesome rather quickly, and after realizing that she just CantCatchUp, she ultimately has to rely on her two teammates yet again.]]
* In ''Anime/UmiMonogatari'', the Elder Turtle has shades of this; not only is he wrong about which priestess will fall into darkness, he doesn't comprehend what Sedna truly is and gives wrong information as a result.
* From ''Manga/DragonBall'', Krillin when he was a kid. He is knowledgeable about martial arts, but he likes to act like he knows more than he actually does. This is made worse that his training partner, Goku, is really naive and often defers to Krillin when something confuses him. He thankfully gets better as the series goes on.
* Seto Kaiba from the English dub of ''Anime/YuGiOh'', mainly for being the token skeptic, continually denying magic despite his technology glitching and the impossible happening right in front of his eyes.
* [[AnnoyingYoungerSibling Max]] from ''Anime/{{Pokemon}}'' comes across as this, chastising Ash for losing in a high-level battle tournament and claiming that he could've done a better job. Later episodes demonstrate that Max's battle tactics suck.
* Whisper from ''Anime/YokaiWatch'' keeps on insisting he's incredibly knowledgeable on {{yokai}} when he uses a Wiki for help and gets facts wrong on his own. It later comes out that this trope is the kind of Yo-kai he is, with his power being spewing a gas that induces others to confidently state made-up facts to whoever's around, though that wasn't the case for the 1st game, and even then, he's still quite intelligent and capable in the rest of the games, even when he's using the Wiki more often than the 1st. Hell, he's usually the one to figure out any Yo-kai mischief nearby in ALL the games instead of [[AdaptationalWimp just bizarrely denying it like in the anime.]]

[[folder:Comic Books]]
* [[Comicbook/ChickTracts Jack Chick]]. Beyond his tin foil hat theories about the Jesuits founding communism as part of a centuries-long plot to get Russian gold, he even manages to get very basic facts wrong. Like claiming that Kaiser Wilhelm II was Catholic. Wilhelm and his ancestors had been Protestant - first Lutherans, then Calvinists, then ''Altpreussische Union'' (an amalgamation of the two) - for ca. 400 years.
* This is a character flaw of Horace Horsecollar in the ComicBook/MickeyMouseComicUniverse. Always quick with an answer for everything, but really not as smart as he thinks he is. In particular, Clarabelle Cow easily outsmarts him whenever they cross wits. Unfortunately, this [[TooCleverByHalf makes her think she's smarter than she really is]].
* [[GoldfishPoopGang Burt Schlubb and Douglas Klump]] from ''ComicBook/SinCity'' are two crooks who like to use large, important-sounding words to make them appear intelligent; unfortunately, their wordy speeches (which are often full of malapropisms) do little to hide how dimwitted they actually are.
* ''ComicBook/SuskeEnWiske'': Lambik, who fancies himself an intelligent, brave, strong and civilized gentleman, but is actually TooDumbToLive.
* Brainy Smurf has a library of books, all written by him, all useless. Whenever he gives a useless lecture to Franchise/TheSmurfs, they hit him with a hammer.[[note]]The series changes this to the more familiar throwing him out of the village.[[/note]] He also insists that "Papa Smurf is always right."

[[folder:Fan Fiction]]
* [[Anime/NeonGenesisEvangelion Ritsuko Akagi]] insists that she knows what's going on when confronted by something outside her understanding, despite others having as much or even better knowledge than her. Such as Shinji turning into an [[WesternAnimation/MyLittlePonyFriendshipIsMagic Alicorn]] in ''[[https://www.fanfiction.net/s/8296097/1/ Shinji's Nightmare.]]
* Similarly in ''[[Fanfic/AlphaAndOmega Alpha and Omega Book 2: The Fallen,]]'' Ritsuko claims Shinji doesn't know anything important about [[Franchise/MassEffect Councilor Tevos']] situation even though, given that Shinji's the only one who knows her species, he clearly knows more about Tevos than anyone else present. Though Ritsuko doesn't know that Shinji also has a medical doctorate from his mother's memories and has studied Asari physiology.
* BigBad of ''FanFic/AngelOfTheBat'' The Seraphim really jerks back and forth on this. He is capable to quoting and is an active reference to obscure and unusual aspects of Christian history and mythology, but as Batman points out, he wasn’t even smart enough to use the singular aspect of his title, making it grammatically incorrect. (His title should be “The Seraph”, “The Seraphim” is plural)
* In ''[[http://www.tthfanfic.org/Story-26870-98/RubyPaladin+The+Bunny+Hutch.htm Hail to the King]]'', [[Series/BuffyTheVampireSlayer Maggie Walsh]] dismisses the claims of a giant monster being Godzilla "unlike her lesser educated colleagues" only for the President to show her a video of Godzilla fighting a giant monster and saying, "It's a 30 story lizard that breathes fire. That's Godzilla."
* Hermione is an odd example in ''[[https://www.fanfiction.net/s/11689576/1/Raptor Raptor]]'' as she's normally an InsufferableGenius but becomes a complete moron whenever the subject of dinosaurs comes up. It takes her ''years'' to recognize that the creature hatched from Hagrid's egg and imprinted on Harry is a velociraptor and even when Film/JurassicPark is being built, she doesn't make the connection or understand why people are becoming more interested in dinosaurs. Though part of her problem comes from her insistence that dinosaurs are extinct and thus irrelevant.
* ''FanFic/EscapeFromTheMoon'': In the sequel ''The Mare From the Moon'', Spliced mentions having had to deal with a few of these in her classes as a younger pony, including one student who, after failing a history exam, still insisted he was right and the textbook was wrong. Then there was the one who went as far as trying to change the historical records to match up with what he claimed was right, but was caught almost immediately.

* ''Franchise/DisneyAnimatedCanon''
** Scuttle the seagull from Disney's ''Disney/TheLittleMermaid''. He mistakes a fork for a fancy comb and a tobacco pipe for a musical instrument, and he also uses a telescope backwards. This gets {{lampshade|Hanging}}d later on in the film when he's trying to warn Sebastian about something. Sebastian is understandably skeptical, and Scuttle shouts "Have I ever been wrong? I mean, when it's ''important?''"
** Friend Owl from ''Disney/{{Bambi}}''. The 'advice' he gives Bambi and his friends is actually terrible advice to give to young animals. Fortunately, it mostly gets ignored once "twitterpation" sets in.
** Timon from ''Disney/TheLionKing'' authoritatively explains that stars are really fireflies stuck on "that big bluish-black thing."
** Jasper in ''Disney/OneHundredAndOneDalmatians''. His shtick with Horace is that Horace hits upon what's really going on and then Jasper emphatically calls him an idiot for getting such a stupid idea.
* Mr. Thicknose in the eighth ''WesternAnimation/TheLandBeforeTime'' film turns out to be this. Originally respected as the smartest resident of the Great Valley, having "been everywhere and seen everything", he soon confesses to the kids that he gets most of his knowledge from second-hand sources.
** In the original film, Cera was this. She frequently boasted about always knowing the right way to do things, only to go on to prove that she, in fact, did not. She ended up suffering quite a bit of [[HumiliationConga humiliation]] because of it--particularly after she lands the gang sans Littlefoot in trouble while trying to lead them to the Great Valley--and she loses the trait in the sequels.
* Nim Galuu from ''{{WesternAnimation/Epic}}'' is only as powerful as the scrolls that write the forests' activities, which cannot predict the future, and can only record so much. In the climax, MK calls him out on how he's relatively useless on his own.
* The members of the Film Actors Guild in ''Film/TeamAmericaWorldPolice'', believe themselves to be highly knowledgeable and compassionate intellectuals, but they're really just StupidGood actors who have no idea how the world outside of Hollywood works.
-->'''Tim Robbins''': Let me explain to you how this works: you see, the corporations finance Team America, and then Team America goes out... and the corporations sit there in their... [[DepartmentOfRedundancyDepartment in their corporation buildings]], and... [[BuffySpeak and, and see, they're all corporation-y]]... [[MissingStepsPlan and they make money]].

[[folder:Film--Live Action]]
* Moe of ''Creator/TheThreeStooges'' is arguably the best example ever of this trope. He often rudely bosses Larry and Curly (and Shemp) around for goofing up and considers himself smarter than them but is clearly every bit as dim as they are. (His RealLife self, however...)
* Oliver Hardy's character in ''Creator/LaurelAndHardy'' also presents himself as the bossy, arrogant, intelligent, more polite and civilized one of the duo, but is actually not that much sharper than Stan Laurel's character.
* Otto, the [[LargeHam Bombastic]] {{Jerkass}} [[StrawNihilist Nietzsche Wannabe]] [[{{Eagleland}} American]] psychopath in ''Film/AFishCalledWanda''.
-->'''Wanda''': To call you stupid would be an insult to stupid people! I've known sheep that could outwit you. I've worn dresses with higher [[YouFailTheIQTest IQs]]. But you think you're an intellectual, don't you, ape?
-->'''Otto''': Apes don't read philosophy.
-->'''Wanda''': Yes they do, Otto. They just don't understand it. Now let me correct you on a couple of things, OK? UsefulNotes/{{Aristotle}} was not Belgian. The central message of UsefulNotes/{{Buddhism}} is not "Every man for himself." And the London Underground is not a political movement. Those are all mistakes, Otto. I looked them up.
* Jimmy from ''Film/{{Barbershop}}'' is only working at the shop to pay his way through college, and he tends to lord his superior education over his fellow workers. Problem is, he frequently gets his facts wrong, such as when he corrects another character by saying that scallops aren't mollusks (they are) and that a local store owner is Pakistani, not Indian (no, he's definitely Indian and quite resents being called Pakistani, thank you very much).
* Calvin Candie, the villainous Southern slaveowner from ''Film/DjangoUnchained'', certainly thinks himself a wise and cultured man, particularly with his love of French culture. However, he doesn't speak the language (guests are specifically advised not to speak French around him so as not to embarrass him), doesn't know his favorite French author Alexandre Dumas was black, and justifies his beliefs in racial superiority with pseudo-scientific phrenology (already discredited among scientists even at the time).
* ''Film/{{Zelig}}'', who has the uncommon ability to [[TheZelig blend in]] and be [[MistakenForSpecialGuest mistaken for someone important]], despite knowing [[FeigningIntelligence very little]], is somewhere between this and SeeminglyProfoundFool.
* Inverted in Music/TheMonkees’ 1968 movie, ''Film/{{Head}}''. Peter, frustrated that the guys wouldn’t listen to him after warning them about the “Black Box,” makes them sit down to listen to his highly intelligent philosophy passed down to him by the [[OldMaster Swami]] earlier in the film. His monologue closes with: “But then … why should I speak, since I know nothing?”
* Paul, the "pseudo-intellectual" in the Creator/WoodyAllen film ''Film/MidnightInParis'' acts like an expert on general Parisian art and culture, but is proven wrong several times. It doesn't stop him though.
* ''Film/GranTorino'': Invoked and played straight: Just after Walt accuses Father Janovich of being this after hearing his wife's funeral speech, Father Janovitch asks him what Walt knows. Walt realizes that he knows plenty about ''death'', but not a lot about ''life.''
-->'''Walt:''' [[MeaninglessMeaningfulWords ''Death is bittersweet''? ''Bitter in the pain, sweet in the salvation''? ]] [[TheReasonYouSuckSpeech That’s what you know of life and death? Good God, it’s pathetic.]]
-->'''Father Janovich''': [[LetsSeeYouDoBetter What do you know, Mr. Kowalski?]]
-->'''Walt:''' Plenty. [[UsefulNotes/TheKoreanWar I lived with death for three years in Korea.]] [[WarIsHell We shot people, we stabbed them with bayonets,]] [[MoralEventHorizon we hacked seventeen-year-old kids to death with shovels, for Christ’s sake]]. [[ShellShockedVeteran I did things that won’t leave me till the day I die, horrible things, things I have to live with.]]
-->'''Father Janovich''': [[ArmorPiercingQuestion And what about life?]]
-->'''Walt:''' [[[{{Beat}} has to think for a second. He struggles with his answer]]] Well... I survived the war... got married... and raised a family.
-->'''Father Janovich:''' [[TheReasonYouSuckSpeech Sounds like you know more about death than you do living.]]
-->'''Walt:''' [[[INeedAFreakingDrink downs a shot]]] [[HeelRealization Maybe so.]]
* [[Creator/WillFerrell Dr. Rick Marshall]] from ''Film/LandOfTheLost'' thinks he's an expert on everything just because he's a brilliant astrophysicist. At one point, he thinks dumping urine on himself will mask his scent, despite everyone pointing out how stupid that is. Indeed, the urine helps the dinosaurs find him faster. He's pretty much consistently wrong about what he knows about dinosaurs (e.g. tiny brains, no depth perception).
* Vizzini from ''Film/ThePrincessBride'' is openly enamored with his perceived intellect, but it is clear that he knows far less than he pretends. He belittles the known great thinkers, he comes up with several [[InsaneTrollLogic far-fetched]] justifications for either cup the masked man may have poisoned (and fails to consider [[TakeAThirdOption a third option]]), and [[YouKeepUsingThatWord keeps misusing]] the word "Inconceivable". It's implied that his long-winded logic behind which cup was poisoned might have just been a cover, and the real point was to get a reaction out of the Man In Black that would reveal something (the Man In Black directly accuses him of doing so), but the whole exchange still proves Vizzini isn't as smart as he thinks he is.
** Neatly encapsulated in this lovely quote:
--> '''Man In Black:''' Truly you have a dizzying intellect.
--> '''Vizzini:''' Wait til I get going! [beat] Where was I?
* Shows up in ''[[Film/FortyTwo 42]]'' with a baseball announcer who declares that African-Americans are naturally faster runners than whites due to having the advantage of a "naturally longer" heelbone. He gets mocked by his peers when Jackie Robinson hits a home run soon afterwards.
-->"How did his longer heelbone help him do ''that?''"
* ''Film/PainAndGain'': Lugo thinks of himself as a GeniusBruiser mastermind, but he's pretty much the [[Film/TheThreeStooges Moe]] of the trio.
* Janine Melnitz of ''Film/{{Ghostbusters 1984}}'' looks fairly nerdy, and she claims people tell her she's "too intellectual" and that she's "very psychic." However, at no point does she actually show any intellectual ability, she constantly misunderstands Egon's comments, and at one point Peter puts her down by pointing out she is only qualified for some pretty low-end jobs. When Egon experiments on Louis Tully, she fails to grasp anything that's going on. During the [[Film/GhostbustersII second movie]], she also proves to be a mediocre babysitter and that's about it. She undergoes CharacterDevelopment and becomes a much more important character in ''WesternAnimation/TheRealGhostbusters'' and other spin-off materials.

* ''Literature/TreasureIsland'': To an extent, Squire Trelawney, who is at loggerheads with Captain Smollett calling him "unmanly" and "un-English". Against everybody's advice, he blabs around about going after Flint's treasure. Trelawney then hires Long John Silver as the cook and has ''Silver'' choose most of the crew. Amplified in the 1934 film, where Nigel Bruce gives the character a "Boobus Brittanicus" quality. Fortunately, once Silver's plot is discovered, Trelawney acquits himself very well, owning himself "an ass" and awaiting the captain's command.
* Speaking of Nigel Bruce, his characterization of Dr. Watson in the ''Literaure/SherlockHolmes'' series with Creator/BasilRathbone bears the "Boobus Brittanicus" nickname. However, the original Dr. Watson also had moments. In "A Study in Scarlet", he unknowingly mocks an article he reads in a magazine to Sherlock Holmes . . . the article's author. In "The Disappearance of Lady Frances Carfax" he arrogantly ignores Holmes' request to describe a suspect's ear, and fumbles the case so badly that Holmes has to go in person to save the situation. Watson similarly performs poorly in "The Case of the Solitary Cyclist". While generally responsible and competent in "The Hound of the Baskervilles", Watson begins by pridefully making a series of deductions on Dr. Mortimer with reference to his cane . . . all of which were incorrect, as pointed out by Holmes.
* ''Literature/{{Animorphs}}'': Rachel's mother Naomi, who doesn't adapt well to going from high powered attorney to camping with aliens and subordinate to her teenage nephew. Not at first, but Naomi eventually proves herself rather useful, helping the Hork-Bajir draw up their own Constitution and persuading Captain Olston to lend his support to the team.
* ''Literature/HarryPotter''
** Gilderoy Lockhart initially appeared to be one of these in ''[[Literature/HarryPotterAndTheChamberOfSecrets Chamber of Secrets]]'', although in the end it turns out he's well aware of his own incompetence, and is impressively competent at concealing it, at least to those who don't know him well.
** Dolores Umbridge in ''[[Literature/HarryPotterAndTheOrderOfThePhoenix Order of the Phoenix]]'' is definitely one. She has virtually no ability to actually teach Defense Against the Dark Arts (having only been put there by the Ministry as a "Ministry-approved" instructor) and is shown to be incompetent in an actual fight.
** Cormac [=McLaggen=] in ''[[Literature/HarryPotterAndTheHalfBloodPrince Half-Blood Prince]]'', much like [[Series/TheBigBangTheory Sheldon Cooper]] below, straddles the line between this trope and InsufferableGenius. He's an above-average Keeper and has some decent tactical ability, but believes he can play every position better than everyone else on the team. When he takes over for Ron during Gryffindor's second match of the year, he tries to command the players in Harry's place, lectures his own team's Chasers for losing the Quaffle to the point of failing to defend the hoops, and takes the Beater's bat out of one Beater's hand with intention to 'demonstrate how to hit a Bludger'. That last one results in him hitting the Bludger ''at his team's Seeker'', cracking his skull and knocking him out for the rest of the match, causing Gryffindor to lose 320-60.
--->'''Harry:''' I don't want to stay [in the hospital wing] overnight. I want to find [=McLaggen=] and kill him.
* Literature/{{Discworld}}
** Sergeant Colon from the ''Literature/{{Discworld}}'' series is a mild version of this. He does consider himself well informed, but the only person he tries to impress this on is Nobby Nobbs, who he's aware may be winding him up. Such as when Colon identifies hieroglyphs as a type of mollusk, and is asked if they go lower they'll find loweroglyphs, and decides to go for broke - everyone knows you don't get loweroglyphs in these waters. It is said he had a broad education; he went to the school of 'my dad always said', the college of 'it stands to reason', and is now a post graduate student at the university of 'what some bloke told me in the pub'.
*** Becomes a point of HypocriticalHumor in ''Discworld/{{Jingo}}'', when someone in the crowd is saying questionable facts and Colon mutters "There's always a know-all."
** Most members of the UU faculty also display a strong tendency towards this trope. Everyone, that is, save Ponder Stibbons, who occasionally fakes it, spouting his own ridiculous explanations because he knows the ''real'' facts will only kick off another off-topic argument among his colleagues) the Bursar (who can actually translate Stibbons' explanation into layman's terms when he's not away with the frogs), Ridcully (who is definitely ObfuscatingStupidity) and the Librarian. And of those four, the Bursar is insane, the Librarian is an orangutan, and Ridcully is not averse to flying off into tangential arguments of his own. Though, again due to ObfuscatingStupidity, he could be doing that on purpose. (In ''Discworld/UnseenAcademicals'' he deliberately starts an irrelevant discussion on whether the wizards are in fact "toilers by hand and brain" or "slackers by hand and brain", before deciding that "[h]e could do this all day, but life couldn't be all fun.")
*** Part of this phenomenon, in the case of the wizards at least, may be attributable to the fact that (much like real-life scientists up until about the turn of the twentieth century) they consider new breakthroughs to be gross discourtesy rather than something to strive for.

** Granny Weatherwax does this as well, insisting that elephant is "a kind of badger". Granny is well aware of her own shortcomings, but her 'Headology' requires her to make the common folk consider her nearly omniscient.
* ''Literature/WinnieThePooh'': Owl and Rabbit both think they know it all, but whenever they try to explain anything, it becomes obvious they're just making it up as they go along. Owl is an example of a dead subtrope which was common back then; a Victorian school graduate with surface knowledge and a lot of arrogance, and the fact that he is barely literate takes the trope UpToEleven. Still, at least he's not particularly egotistical about it - Rabbit, however...
* Yefrem Levitan's educational ''[[ExactlyWhatItSaysOnTheTin Book About Stars & Planets]]'' features a self-praising gnome's wild stories about his supposed space adventures; the readers' objective is to find [[ArtisticLicenseAstronomy all the flaws in his stories]], and there are ''many''.
* Brother Verber, from Joan Hess's Maggody mysteries, recites Bible phrases at the drop of a hat. As he's the inept product of a fly-by-night correspondence-course seminary, he constantly misquotes them, mistakes their verse numbers, and/or takes them so far out of context as to be irrelevant.
* This is the defining personality characteristic of Stingray from ''ToysGoOut'' and its sequel ''Toy Dance Party''.
* The character Jesse Honey, in Mark Helprin's ''Winter's Tale'', thinks he knows everything but is laughably incompetent, and [[TheNapoleon takes any critique as a shot at his diminutive height]]. It gets him another character, Hardesty Maratta, into trouble or injured several times, [[spoiler:and eventually gets Jesse killed]]. In fact, the entire episode serves mostly to illustrate that Hardesty (a UsefulNotes/WorldWarI veteran) is an ''extremely'' fortunate man. Another character, Juliet Paradise, is a self-proclaimed intellectual who is noted to believe that a goat is a male sheep.
* Mary from ''Literature/PrideAndPrejudice'' can be read as one. The book implies that while she studies hard, she doesn't take in much and can learn the mechanics but not the soul of what she studies. It's shown most during the brief times she's allowed to talk, where she almost always moralizes about obvious things with all the arrogance and pride of someone making a great discovery.
* Kirtan Loor from the Comicbook/XWingSeries has a PhotographicMemory and, because of it, thinks himself a genius and is always surprised when his plans don't work. Early in the series he's taken before the BigBad and lambasted for his flaws, most notably a tendency not to ''think''. For the rest of the series he proceeds believing himself to have changed, but one or two insights aside he really hasn't. It's not until [[spoiler:his death]] that he realizes that he's kept falling back on his old habits without even realizing it.
* Most of the humour in Kaz Cooke's ''Little Book of X''..er...books comes from the author taking this role, providing "advice" on whatever subject that is one million per cent useless. ''The Little Book of Beauty'' suggests the use of wood glue for hair care, for Pete's sake.
* Creator/MarkTwain discovered one of these among his fellow passengers on the trip he took in ''The Innocents Abroad.'' Dubbed "The Oracle," his hilariously inaccurate observations (like pointing out "the pillows of Herkewls" in the Strait of Gibraltar) were encouraged by the other voyagers.
* Eliza in ''Literature/SomeoneElsesWar'' is quite bossy, but rarely ever in-the-know.
* ''Literature/AdrianMole'' considers himself an "intellectual" and brilliant author with a wide knowledge of art, literature, history and culture. In reality his writing (all unpublished) is terrible and he frequently confuses writers, important events, public figures and branches of the arts. He is also shown to have limited general knowledge, such as not knowing why someone called Pandora would have the nickname "Box", or thinking that someone in the UK could take a day trip to China.
* British statesman Lord Chesterfield wrote about them in ''Literature/LettersToHisSon'': "coxcombs, who have no learning at all; but who have got some names and some scraps of ancient authors by heart, which they improperly and impertinently retail in all companies, in hopes of passing for scholars." (letter XXX)
* In the Literature/{{Greyfriars}} stories, Billy Bunter lives and breathes this trope along with its accompanying trope, IgnorantOfTheirOwnIgnorance, unless the plot requires him to (always temporarily) come to his senses.
* ''Literature/ThePhantomTollbooth'' features the Overbearing Know-it-all in the Mountains of Ignorance, the AnthropomorphicPersonification of the concept.
-->''From off to the right...came the Overbearing Know-it-all. A dismal demon who was mostly mouth, he was ready at a moment's notice to offer misinformation on any subject. And, while he often tumbled heavily, it was never he who was hurt, but rather the unfortunate person on whom he fell.''
* Among the Ten Fools (religious figures from ''Literature/TheStormlightArchive''), we have Eshu, who speaks of things he does not understand in front of those who do.
* The Laputans from ''Literature/GulliversTravels'' are [[PlanetOfHats an entire flying country of]] Know-Nothing-Know-It-Alls. They devote their entire lives to math, music, philosophy, astronomy, and politics, failing at each one spectacularly.
* In ''Literature/TheDayOfTheLocust'', aspiring but talentless actress Faye Greener meets screenwriter Claude Estee at a party through their mutual friend, set designer Tod Hackett (the novel's protagonist). Rather than ask for advice from the only person in the book who has actually achieved success in the film industry, she positions ''herself'' as the one who knows how to achieve success and talks at length about her career ambitions and how she plans to make them a reality, based on half-remembered and less-than-half-understood things she has read in fan magazines and trade papers. "It was all nonsense," according to the narration, and Claude eventually gives up trying to get a word in edgewise.
* The Creator/ShelSilverstein poem "Smart" deals with one of these, a young boy who is given a dollar by his father for being "his smartest son." He then proceeds to easily swindle a person into taking the dollar, in exchange for... two quarters. Because two is more than one, you see, and therefore he got the better end of the bargain. He then talks several other people into swapping the two quarters for three dimes, then four nickels, then five pennies, each time chortling at his intellect as he effortlessly walks away with more than what he started. When he shows the five pennies to his father and happily explains, all his father can do is [[StunnedSilence stare silently and shake his head.]] Obviously, he's just that proud of him!
* Patrick Bateman in ''Literature/AmericanPsycho'' claims to be a [[PopCulturedBadass big music buff who knows all the best tunes.]] An actual music buff reading his recommendations would kindly describe them as "entry-level", with almost all his favorites being big '80s pop hits. He also rejects anything remotely experimental by his favorite bands, and makes a number of outright errors (apparently, "You Can't Always Get What You Want" is by Creator/TheBeatles). This is much in line with Bateman's desire to be seen as special, contrasting with his inability to do anything outside the box.
* The target of Montresor's hatred in Creator/EdgarAllanPoe's ''Literature/TheCaskOfAmontillado'', the wealthy and well-connected Fortunato, proclaims himself an expert wine connoisseur, but when Montresor suggests inviting a mutual friend with them to sample the titular spirit, he admonishes the idea because the friend "wouldn't know sherry from Amontillado." Amontillado ''is'' a sherry. He also guzzles an expensive fine wine like cheap swill, holds plonk brands in high regard and samples wine while already heavily drunk, something no real wine connoisseur would do; all actions that do little to refute Montresor's opinion that he is really a boorish idiot.

[[folder:Live-Action TV]]
* ''Series/TheAndyGriffithShow'': Barney Fife, played up by Don Knotts. Don Knotts is an overly officious deputy, who once locks up the Mayor of Mayberry for being a vagrant. When he tries to make improvements or "modernize" law enforcement in Mayberry, HilarityEnsues.
* ''Series/LeaveItToBeaver'': Eddie Haskel, Wally's best friend, is always on hand to give bad advice that invariably gets Wally or the Beaver into trouble. [[LampshadeHanging Lampshaded]] several times; one time when Eddie recommends a stock to Wally and the Beaver, and the stock price actually goes up, Beaver complains that they didn't listen to Eddie the one time he was right. [[spoiler: the stock price later collapses when the aeronautics firm Eddie recommends loses a government contract]]
* ''Series/LostInSpace'': Dr. Smith epitomizes this trope. He is ''always'' wrong and his terrible advice and insufferable ego are usually the cause of episode's troubles. Everybody knows this, even young Will Robinson - who although otherwise a precocious genius is susceptible to falling for, or reluctantly facilitating Dr. Smith's latest bout of idiocy.
--> '''Dr.Smith''': [[{{Catchphrase}} Never fear, Smith is here!]]
* ''Series/TheBeverlyHillbillies'': In later seasons, Jethro becomes insufferably conceited and believes he's an expert on everything. This is by virtue of his sixth-grade education and his "giant brain". Some of his low-lights include his attempt at being a talent agent, his belief he can speak Japanese and any number of claims that he's a Hollywood playboy.
* Cliff Clavin of ''Series/{{Cheers}}''. He inherited his "gift of gab" from his mother, Ma Clavin. The big difference is that Esther actually ''knows'' what she's talking about, despite being a know-it-all herself.
-->"Well ya see, Norm, it's like this. A herd of buffalo can only move as fast as the slowest buffalo. And when the herd is hunted, it is the slowest and weakest ones at the back that are killed first. This natural selection is good for the herd as a whole, because the general speed and health of the whole group keeps improving by the regular killing of the weakest members. In much the same way, the human brain can only operate as fast as the slowest brain cells. Excessive intake of alcohol, as we know, kills brain cells. But naturally, it attacks the slowest and weakest brain cells first. In this way, [[ArtisticLicenseBiology regular consumption of beer eliminates the weaker brain cells, making the brain a faster and more efficient machine]]. That's why you always feel smarter after a few beers."
** Cliff was not part of the original ''Cheers'' concept. He was added after John Ratzenberger went to audition for the part of Norm. He ultimately didn't get the part but, while he was there, he pitched them the idea for another character, a typical bar know-it-all. He improvised a performance to give them an idea of how the character would act, and that sealed the deal.
** From time to time, he did actually get things right, and on other some other occasions he was cut off before he actually spewed anything that was incorrect.
** John Ratzenberger said that, according to Cliff, Cliff was "the wing nut that held civilization together." According to Ratzenberger, Cliff is just a winged nut.
* The title character in ''Series/FatherTed'' considers himself an intellectual due to being SurroundedByIdiots on [[CityOfWeirdos Craggy Island]]. Best exemplified in "And Then God Made Women" when Ted tries to impress a BrainyBrunette.
* Britta Perry from ''{{Series/Community}}'' wants to be seen as an enlightened woman of the world, but often betrays her ignorance. Pierce Hawthorne is even worse; he's a foolish, addled old bigot convinced of his own brilliance. [[spoiler: Chang]] turns out to be this, after TheReveal he made up his credentials.
* ''Series/GameOfThrones'':
** Ygritte has shades of this. Although she knows much about her own people and constantly teases Jon that he knows nothing, she herself mistakes a windmill for a great castle and seems completely ignorant of the wildlings' previous failed invasions.
** Despite his pretenses of restoring the family name and dreams of being a conquering hero, Viserys is thoroughly incompetent about politics and incapable of commanding an army, as noted by both Jorah and Daenerys.
--> '''Daenerys:''' My brother didn't know anything about dragons. ''[{{beat}}]'' He didn't know anything about anything.
* Mr. Chekov, of ''Series/{{Star Trek|The Original Series}}'' fame, thought that everything from genetically modified wheat to the written word was a Russian "inwention". Given that the show was made during the UsefulNotes/ColdWar, he was never right about any of it. This is actually TruthInTelevision, as Soviet propaganda tried to trace many things to Russian inventors, to the point that people started joking that "Russia was the homeland of elephants", or the greatest inventor of all time, [[Creator/LeonardoDaVinci Lenard da Vishinski]]. This attitude of Chekov was spoofed in a novel by Creator/DianeDuane, when he claimed that roller coasters had been invented by Russians. Nobody believed him, as the first roller coaster had been patented by an American... Yet, Russians actually created the ancestor of roller coasters, the Russian mountains, and in many languages (like Italian, Portuguese or Spanish) the roller coasters are called the local language's translation of "Russian mountains". In regard to the genetically-modified wheat, there's something to that too, in that Stalin was a huge fan of Trofim Lysenko's [[ArtisticLicenseBiology unorthodox ideas about evolution]], and tried to create a new superwheat to feed the country. [[GoneHorriblyWrong It did not go well for anyone]].
* In the original ''Series/TheTwilightZone1959'' episode "Hocus-Pocus and Frisby" (under the late great Creator/RodSerling), a small-town bumpkin was this, and everyone around knew it (including himself). Except the aliens (who had never evolved the concept of lying) who overheard him, mistook him for the greatest human brain ever, and kidnapped him for their zoo. He escaped through courage and dumb luck. And when he tried to tell people ... CryingWolf, anyone?
* In a slight departure, Creator/StephenColbert portrayed himself as an extremely far-right Republican Know-Nothing Know-It-All in ''Series/TheColbertReport'' . For that matter, most TV pundits in the US are like this; parodying this was the original premise behind ''The Colbert Report''.
* Kathleen from ''Series/DegrassiJuniorHigh'' is a borderline case. She really does know more than the rest of the cast, but she's such a ControlFreak that this knowledge is rarely relevant to anything. She drives a science fair judge crazy by reciting every stack of facts she knows, never giving her partner a chance to talk, and is shocked when that doesn't earn her first prize. A RunningGag on the show is that when Caitlin (the overachieving SchoolNewspaperNewshound) needs to come down to earth a bit, it always happens by way of Kathleen doing something better than her -- which is the most humiliating thing possible.
* Reversed in ''Series/HogansHeroes'', where Schultz was always quick to assure people that he "knew nothink!", when in fact he knew more about Hogan's operation than any of the other Germans ''and'' realized that [[ObfuscatingStupidity playing dumb]] and [[IllPretendIDidntHearThat ignoring the issue]] was his best option.
* Parodied in ''Series/TheRedGreenShow'' in the segment where they examine the three hardest words for a man to say: "I DON'T KNOW!" Thus, the guest is always morphed into one of these. Played straight with Hap Shaughnessy who, in any episode that features him, claims to have invented a common item or to know the reasoning of historical figures due to him being there when they made their decisions (if he wasn't responsible for them making the decision in the first place).
* In ''Series/TheMuppetShow'', Sam the Eagle claims to value culture, but in reality he's a complete ignoramus with the arts. For instance, he didn't recognize the world famous ballet dancer, Rudolph Nureyev, in street clothes and thought Creator/WilliamShakespeare was a composer. He also tried to sing ([[UsefulNotes/{{Japan}} karaoke, cause it's a nice American activity, even!]]) "American Woman" in one of their Website/YouTube videos. When the machine told him it was by The Guess Who, he hazards, "Um, I don't know...John Philip Sousa?" before trailing off halfway through the third or fourth line, demanding to know who was responsible for the blatantly anti-American lyrics. And he ''really'' flips it when Kermit tells him The Guess Who is a ''Canadian'' band.
* Paul Kinsey of ''Series/MadMen''. Perhaps his defining quote in the series wasn't actually said by him, but rather about him; "We ''get'' it, you're educated."
* All of the main characters in ''Series/ItsAlwaysSunnyInPhiladelphia''.
-->'''Charlie:''' This bar runs on trash. It's totally green now.
-->'''Dennis:''' How is burning trash green?
-->'''Charlie:''' I could stick it in a landfill, where it's gonna stay for millions of years, or I could burn it up and let it disappear into the sky where it turns into stars.
-->'''Mac:''' That doesn't sound right, but I don't know enough about stars to dispute it.
* Creator/DannyKaye had a number of characters who were this. Though most of them were one-offs.
-->'Yes, my friends, do you realize you can live to be a 127 years old... ''if'' you listen to Petrov?
-->[[spoiler:First, you have got to live for a hundred and twenty six years. Then, you have to be very very careful]]'
* Sheldon Cooper of ''Series/TheBigBangTheory'' is normally a straight-up InsufferableGenius... when you're dealing with a body of knowledge he has experience with, such as physics. Get him onto something more practical, however, and while his knowledge base drops dramatically, his ''opinion'' of his knowledge base remains as insufferable as ever.
* Neelix of ''Series/StarTrekVoyager'' claims to be competent at many things (diplomacy, navigation, survival, cooking...) but he fails almost every task he's given. Sometimes it's hard to tell whether he's supposed to be this trope, or if they're {{Informed Abilit|y}}ies. To be fair, Neelix is quite knowledgeable about the Delta Quadrant, which is why he's the ship's designated guide. The comedy in the character comes from his desire to prove that he's more than just a tour guide. He's also a competent cook, it's his very limited selection of ingredients that make his food less than savory. In the case of diplomacy, he does manage to recover from a diplomatic incident caused by Janeway putting her hands on her hips, which is a grave insult to a race that relies heavily on body language. He proves himself quite adept at their "language", knowing all the right gestures and phrasing.
* Foggy Dewhurst of ''Series/LastOfTheSummerWine'' has deluded himself into thinking that he knows the answer to any problem the trio is stuck in, when more often than not, he just makes things worse, mostly for himself.
* Rory Gilmore of ''Series/GilmoreGirls.'' Yes, Lorelai ''Junior.'' Although she excels academically, she is often lost in social situations.
* In ''Series/DowntonAbbey'', Robert hires Sir Phillip Tassel to assist in Sibyll's childbirth. The family physician expresses concern that Sibyll is suffering from Eclampsia. Tassel dismisses this right until the end, saying what she's experiencing is normal. [[spoiler: The other physician was right, [[TearJerker and Sibyll dies from Eclampsia]] ]]. Yeah.
* Bill [=McNeal=] from ''Series/NewsRadio'' quite frequently. He once attributed the line, "Gather ye rosebuds while ye may" to the poet John Keats in 1776. Too bad that 1) that wasn't Keats, it was Robert Herrick, and 2) it wasn't written in 1776; in fact, neither man was alive then, Herrick having died in '''16'''74, and Keats not being born until 1795.
* ''Series/{{Frasier}}'': Roz's arrogantly ignorant hipster friend Jen, who, among other things, wants to go to Vietnam on vacation because "Americans haven't heard of" the country, and that an art gallery mostly focused on paintings of ''landscapes'' is intended to "make us feel good" about American "imperialism".
* Jay Cartwright from ''Series/TheInbetweeners'' constantly brags about his knowledge of sex. [[CasanovaWannabe Of course, he's a virgin until the end of the first movie]].
* Rick from ''Series/TheYoungOnes'' is convinced he's a anarchist when really he's a misinformed StrawmanPolitical.
* Reoccuring goofball villain Pete Hutter from ''Series/TheAdventuresOfBriscoCountyJr''. He has a massive vocabulary of big words, and acts as if hes an expert in numerous fields, from Fine Arts to Archietecture to Economics to Train Engineering, but he ends up being one of the dumbest characters on the show.
* Chidi Anagonye in ''Series/TheGoodPlace'' is an odd variant. He's actually very knowledgeable about his chosen subject (ethics and morality), but he also happens to be TheDitherer. He loves to talk about it and he knows it very well, but he has no actual point or conclusion in his studies, and no actually useful information. The biggest indication is when we see his DoorStopper of a book on morality... and it's a complete mess, to the point that a celestial being of inhuman sight has a hard time getting through it. Indeed, over the course of the series, he presents contradictory views many times (in the aforementioned book, he reportedly contradicted himself ''midsentence''.

* Death: "The Philosopher"
-->''You know so much about nothing at all.''
* The subject of Music/MenWithoutHats' "I Like".
-->''I like when they talk real loud, try to tell you what they know.''
-->''I like when it blows real hard and it doesn't even show.''
-->''I like when they haven't seen a thing and try to tell you where to go.''

[[folder:New Media]]
* At least half of any given fandom regarding the fandom itself. Especially the StopHavingFunGuys and {{Scrub}}s in fandoms that have them.
* TruthInTelevision: Just go on a MessageBoard. You'll get loads of [[strike:total idiots]] experts on many subjects. Played straight and averted by 4chan. This is a product of the fact that users of some boards completely loathe all the other boards. Interest based boards commonly avert this, and are somewhat filled with level-headed individuals who are generally intelligent and well informed in regards to the board's topic (/co/, /tv/, /sci/, /lit/, and /a/ on a good day). The rest of the site tends to play this straight though, particularly the more easily trolled boards. /pol/ is quite possibly the worst offender, as at least 50% of its userbase are superbly ignorant Neo-Nazis who spam The Bell Curve, with the other 50% composed of trolls posing as [[StrawCharacter strawman liberals or conservatives]].

[[folder:Newspaper Comics]]
* RJ the raccoon from the comic strip ''ComicStrip/OverTheHedge'' (not so much TheMovie) makes up explanations for everything to the gullible woodlanders (to the annoyance of Verne, who usually has the accurate answer but can't explain it in a way anyone will understand).
%%* Bucky Katt of the comic strip ''GetFuzzy''.
* ''ComicStrip/{{Peanuts}}''
** Lucy Van Pelt thinks that snow falls up, fir trees have fur on them, and that a chain line is so that climbers can all fall of mountains and die together instead of it having the exact opposite purpose (so that the climber falling doesn't fall to his death because the others are holding him up).
** Snoopy had some moments like this too. His rule of thumb whenever he got lost was that the moon is always over Hollywood.
** A variant is Peppermint Patty; she'll get a dumb idea from a complete misunderstanding about something, ignore all common sense advice as she pursues this fixation until she humiliates herself and typically blames the people who warned her for not stopping her.
** Sally Brown. She's too lazy to do research for her homework, so she usually just makes things up. While she has no qualms about simply bluffing, she often does mistakes in good faith, based on what she's heard or what she thinks she's heard.
* ''ComicStrip/CalvinAndHobbes'':
** Calvin's dad does this sometimes when Calvin asks him questions, but he's doing it on purpose. (Read: just making shit up and silently laughing at Calvin for believing him when he says, for example, that old pictures are in black and white because the whole ''world'' was black and white when they were taken.) Watterson's commentary says that he assumes it must be a great temptation for real parents not to abuse their power for pranks.
*** One strip in particular had Calvin ask what makes the wind blow, which his dad initially tells him is "Trees sneezing". When Calvin questions this, his dad admits that the truth is more complicated. Cut to Calvin and Hobbes walking with a heavy wind.
---->'''Calvin''': Boy, the trees sure are sneezing today.
** Then there's Calvin. One arc has him write a report about bats (which he based entirely on his idea that bats were bugs [[InsaneTrollLogic because they fly and are ugly and hairy]]) He boasts about how clever it was (writing it took fifteen minutes as opposed to Susie's report taking all evening) and how he'd get a good grade because he put it in a clear plastic binder. The moment where his whole class tells him that bats aren't bugs is the page image for CriticalResearchFailure.
** Another example is how Calvin acts like he knows how to fix a leaky faucet despite never doing so before. Predictably, he winds up flooding the bathroom instead.
** Despite the picture above, Hobbes is not usually an example: [[EverybodyHatesMath math just isn't his strong suit]]. Why Calvin keeps asking him for help after all the bad grades he must get is something of a mystery. [[FridgeBrilliance Possibly because he's in Calvin's head, and no smarter than Calvin at his best.]] WordOfGod states that one reality is Calvin's immature point of view, while the second is an adult point of view, and [[ShrugOfGod the reader can decide which is true]].
* Howland Owl may be the best example from ''ComicStrip/{{Pogo}}''. But then, nearly everyone in the comic is absurdly ignorant and doesn't realize it.

[[folder:Professional Wrestling]]
* Nite-stic Eddie Brown came out of retirement in 2012 because he felt his students in promotions such as Ring Wars Carolina were becoming too complacent.
-->"When you get to that point where you think you know everything about wrestling? They change the game on you. Nobody knows everything, trust me."[[/folder]]

* The character of Dottore in classic ''CommediaDellArte'' is often played as smugly satisfied with his own learning, despite his ineffectiveness. In a script that cast him as a medical doctor, for example, he would speak perfect Latin, but his patients would all die.
* This is Slightly's shtick in ''Theatre/{{Peter Pan|1904}}'' (and any incarnations thereof in which he appears). While none of the Lost Boys remember anything about life before they joined Peter's band, Slightly is constantly faking knowledge, convinced that he remembers himself.
* Feste of ''Theatre/TwelfthNight'' claims to avoid it because "it is better to be a witty fool than a foolish wit."

[[folder:Video Games]]
* ''Franchise/KingdomHearts'''s Axel gives hints of being this in ''358/2 Days'', when he talks about why the sky turns red.
* Theodore from ''[[VideoGame/{{Persona3}} Persona 3 Portable]]'' claims to know all about the human world, but its fairly evident that he's clueless about [[NoSocialSkills human interaction in general]].
* Rinnosuke Morichika of ''VideoGame/{{Touhou}}'', who's convinced that he knows far more than he actually does and [[CharacterFilibuster will talk at great length]] about it. The [[http://en.touhouwiki.net/wiki/Curiosities_of_Lotus_Asia/Afterword afterword]] of Rinnosuke's own sidestory ''Literature/TouhouKourindouCuriositiesOfLotusAsia'' has [[WordOfGod ZUN himself]] noting that "Rinnosuke's supposed vast storage of knowledge comes almost entirely out of thin air. Indeed, he doesn't know nearly as much as he thinks he does."
* The aptly named Fact Sphere from ''VideoGame/{{Portal 2}}'', which repeatedly states various facts that while sometimes true, are more frequently partial truths or completely wrong. It also states various (Often egotistic) facts about itself:
--> [[BlatantLies The Fact Sphere is not defective.]] Its facts are wholly accurate and very interesting.
--> The Fact Sphere is always right.
--> The Fact Sphere is the most intelligent sphere.
* Mao in ''VideoGame/Disgaea3AbsenceOfJustice'' will frequently boast about having a 1.8 million E.Q (Evil Quotient), but is utterly clueless about simple concepts like love, truth, and friendship.
* ''VideoGame/DisgaeaDimension2'' gives us the Krichevskoy Group, a trio of monsters that claim to follow King Krichevskoy's will and want to dethrone Laharl because they believe he's an InadequateInheritor. However, they don't seem to have a grasp on what made Krichevskoy a great and charismatic Overlord and for all their disrespect towards Laharl, Laharl shows throughout the game that he acts far closer to Krichevskoy than the very demons who worship him.
* The Institute of ''VideoGame/{{Fallout 4}}'' are all scientific knowledge, with zero ''practical'' knowledge of how to apply it. They seclude themselves underground, spending nearly two centuries going nowhere with boondoggle after boondoggle experiment, use their most impressive inventions [[RidiculouslyHumanRobots (the Synths)]] as nothing but cheap slave labor and people snatchers, and trying to crack experiments (the Forced Evolutionary Virus, intelligent machines, the use of teleportation) that previous game characters and factions such as already did better.
** To elaborate further, the Institute is narcissistic enough to think that everyone above-ground is beneath them (not literally of course) while the Shi over in California were able to develop a vine that absorbs radiation to make land more livable, make synthetic oil out of seaweed, and in 2242 were able to rediscover nuclear power and manufacture new reactors (without relying on [[PlotDevice pre-war technology]] like the Institute), accomplishing more than the Institute ever could in a much shorter span. Also, despite the Institute claiming to have the most advanced technology, their laser weapons are less powerful than ones developed pre-war. As for their FEV program, the Institute spent a century turning people into Super Mutants with the goal of studying the effects of FEV on humans to improve the synths, but rather than working on curing them which West-Tek figured out how to do back in 2077, they simply released them into the wild.

* Qui-Gon (or at least his player, Jim) in ''Webcomic/DarthsAndDroids''. Whenever the Game Master makes up a word Jim insists he knows what it means, be it "Jedi" (It's a type of cheese), "Naboo" (Fish oil mixed with liquor) or "midi-chlorian" (exactly the same as ''Franchise/StarWars'' midi-chlorians; in this case, [[ThrowItIn the GM just threw up his hands and went with his explanation]], even though it was ridiculous).
** He remains firmly under the delusion that he can [[http://darthsanddroids.net/episodes/0033.html 'Summon Bigger Fish']].
** Although it was reversed when the DM used the term "Vergence", which he thought he had made up but which Jim actually knew the definition of. Turns out he's not the idiot he seems, and is working on a Ph.D in geophysics. He just likes to "turn his brain off" when gaming, turning him into a GeniusDitz when something burns through the fog.
* King Steve from ''Webcomic/EightBitTheater''. Completely insane, but how do you argue with someone who "invented inventing"?
** Also Red Mage to some extent.
*** [[TooDumbToLive "To some extent?"]]
* The FurryWebcomic ''Webcomic/NipAndTuck'', by Creator/RalphHayesJr, justifies [[StrawCharacter Gilly Gopher]] as being the ButtMonkey that he is because he's a Know Nothing Know It All.
* Kankri from ''Webcomic/{{Homestuck}}''. He fancies himself as an authority on social justice, and will [[WallOfText go on and on and on]] about class warfare and the injustices of the caste system - completely failing to realise that his society is free of such problems, mainly because it now consists of exactly twelve individuals who are all ''dead'', and none of them give a fuck anyway. He is also incredibly dismissive about other people's actual issues and social problems, despite priding himself on avoiding "triggers".
* In ''Webcomic/TailsTheDouche'', Tails corrects Knuckles after he introduces himself as an echidna, telling him that it is pronounced "arachnid".
* ''Webcomic/TheScumthorpeFiles'' has Tara Dunning, who was [[WordOfGod confirmed]] to be named after the Dunning-Kruger effect. She claims she's the most mature, intelligent girl in her class, but [[SmallNameBigEgo the opposite is true]]. Perfectly shown when the sixth grade class is learning sex-ed and Tara launches into a description straight out of a trashy novel, having no clue what her words really mean.
* ''WebComic/StandStillStaySilent'': Emil had expensive private tutors growing up, but the story keeps dropping hints that they failed at actually teaching him anything. First, his grades dropped when he went into public school after his family's RichesToRags episode. Second, any high knowledge level information he shares tends to be blatantly wrong and just asking to be corrected by one of his crewmates who got an actual education. However, since he hasn't figured out that the problem was his tutors and not the public school system having it in for him, he still thinks of himself as well-educated, and shares his inaccurate knowledge with certainity that it's right.

[[folder:Web Original]]
* In ''Literature/BabeRuthManTankGladiator'' Throckle No'Goor insists that he's an expert on the 21st century.
* WebVideo/{{Ask That Guy|WithTheGlasses}} is a particularly psychopathic version of this. It's implied in some episodes that he knows he's wrong and just does it for the fun of it, such as in one episode where he's asked "why is my nose bleeding?". He begins going on about how every nose goes through what's called a "nose-period", but then just shouts out "I don't know! What kind of a stupid question is that?" A less insane ([[MadLove but]] [[StalkerWithACrush only]] [[SanitySlippage slightly]]) version from the same site would be WebVideo/TheNostalgiaChick. Best showcased in the ''[[Film/XMenFilmSeries X-Men]]'' review, where normal!Chick brushes off Dr. Tease with "I know everything", and Chick on TruthSerum admits that the mutant powers really confused her as a kid.
* Early WebVideo/SMBCTheater had this issue with subjects like Christianity, Superheroes and geek culture. However they have stuck with subjects they're more familiar with.
* "Crank" is a pejorative term for a person who holds an unshakeable belief or opinion that most of their contemporaries consider to be false. Unlike the likes of Gallileo, Copernicus and Ignaz Semmelweis (whom Cranks may compare themselves to), whose theories were proven correct despite conflicts with established authorities, Cranks are characterized as overestimating their own knowledge and abilities regardless of others opinions and experience, insisting their discoveries are urgently important while rarely if ever acknowledging faults no matter how trivial.
* In ''WebVideo/UltraFastPony'', Pinkie Pie is a huge fangirl for ''Film/TheLordOfTheRings''. She claims to be an expert on the series, yet she's unaware of basic information, like ''the fact that the movies were based on a book series.''
-->'''Pinkie:''' Oh, yeah, gettin' down in Minas Morgul!\\
'''Rarity:''' I don't think Minas Morgul is the equivalent to Canterlot, Pinkie.\\
'''Pinkie:''' Whoaho, bro. Bro. I am the ''Lord of the Rings'' expert here, and I think I know the name of the city that Saruman laid siege to.
* Doc of ''WebVideo/TheTIMEGuys'' thinks he's a scientific genius, but it's obvious that he has no idea what he's talking about.
* Jace from ''WebVideo/DeagleNation'' claims to be an expert in firearms, parkour, and the US military. Due to this, he ends up spouting out nonsense facts that aren't true at all every time he appears.
* The Healthy Band from ''WebVideo/DontHugMeImScared'' sing about healthy foods but the problem is their views on what is healthy are messed up. 'Bland' and plain looking foods like bread and cream are healthy no matter how processed they are while 'fancy foods' like eggs, vegetables, and fruits are unhealthy. Later they even say white sauce - something they encouraged seconds before - is bad for you.
* ''WebVideo/SuperMarioLogan'':
** As of Part 5 of the "Bowser Junior's First Grade!" story arc, Bowser Junior believes the sun is a planet, much to Cody's disappointment. Unlike Rosalina, who says the same thing but is clearly off her rocket, Junior makes logical arguments which are entirely wrong such as the Sun being round and therefore being a planet. He actually even died when trying to go to the Sun to prove it.
** In "Jeffy's Homework!", When it comes to math, Jeffy thinks 2+2=2 because it makes a baby 2, 8-4=8 because the four is taken away, and 0+0=2 because there are two zeroes who don't love each other. It even causes him to go into a swearing fit and suddenly become more eloquent and curse his diaper, helmet, and pencil, as well as several scientists while claiming that his answers are right. [[spoiler:By the end of the video, Mr. Goodman reveals that he believes in his subtraction reasoning, and it is even named "Jeffy's Law of Subtraction", leading the whole world into believing Jeffy as well.]]
** Both Toad and Chris the Cucumber continuously give out wrong advice while claiming it to be correct.
* Chronicling real-life examples of this is the entire point of [[Website/{{Reddit}} r/iamverysmart]].
* While Mordecai, MMFEC's shaman in ''WebVideo/ShadowrunCorporateSins is a competent and powerful magician he is almost completely useless regarding technology but refuses to admit it.

[[folder:Western Animation]]
* ''WesternAnimation/LooneyTunes'' and ''Merrie Melodies'': WesternAnimation/FoghornLeghorn talks on about how he knows so much, but it's mostly hot air.
** WesternAnimation/DaffyDuck at certain [[DependingOnTheWriter times]], however, he is the case of the SmallNameBigEgo variant.
* Starscream from ''WesternAnimation/TheTransformers'' was always lecturing Megatron about tactics, and naturally, was nearly always wrong. The episode "War of the Dinobots", in which Starscream is suspicious about the instability of the meteorite's energy long before Megatron ever has a clue, is among the exceptions. (That makes a certain amount of sense, since Starscream was a scientist originally).
* Peggy Hill of ''WesternAnimation/KingOfTheHill'', who is convinced she's perfectly fluent in Spanish, when she can't even speak as well as some of the students she teaches as a substitute teacher. She thinks she is incredibly witty and deep. She also feels a need to be the winner, or at least right all the time.
** This is taken to its logical extreme in one episode, in which Peggy takes her class on a field trip to Mexico and accidentally takes a Mexican girl home after misunderstanding her. After she returns the child, she's arrested and tried for kidnapping. She is ultimately acquitted after her attorney has her testify to the court in Spanish, showing the judge that she really did understand Spanish so poorly that the "kidnapping" had been accidental.
*** Best line in that episode?
---->'''Judge:''' ''[in Spanish]'' Not Guilty!\\
'''Peggy:''' Oh God! I'm going to jail!
*** It should be noted though, early on, Peggy actually ''was'' very competent in Spanish, enough to where she got a job as a Spanish customer service representive by talking to a Spanish customer service agent over the phone. As the show went on though Peggy's "loose grasp" on the Spanish language [[{{Flanderization}} got worse and worse with each season.]]
** Another running gag for Peggy is for her to make a very general or well-known fact and tack on, "In my opinion," such as, "The day after Thanksgiving is, in my opinion, one of the busiest shopping days of the year." Her tendency to take credit and boost her own ego eventually came back to bite her when Randy Travis plagiarized a song she'd mailed to him and everyone, including Hank, thought she was CryingWolf.
** In another episode, while Hank and Bobby are out camping, Peggy runs around nosing her way into everyone's business and telling them how they're wrong or trying to show how much smarter she is. Ultimately this results in her going into a crime scene like she's a CowboyCop and getting escorted back to her car as she protests "But I'm on a roll!"
*** Notably, she was the only one to ''not'' know that Nancy had been cheating on Dale with John Redcorn, outside of Dale himself. When she did find out it was only because Hank essentially spelled it out for her.
** Outside of Peggy, the Hills frequently run afoul of various "experts" who have more self-importance than any actual competence in their supposed field of expertise. It's often implied that the reason these people keep ending up in Arlen is [[ReassignedToAntarctica because they can't find work anywhere else]].
** Dale is much the same way, although not to as much of an extreme. It stems more from being a {{Cloudcuckoolander}} who believes his own lies about himself and his own competence. One of the most base jokes about his character is that even though he's convinced he's on the verge of uncovering various government conspiracies, he's too dim to realize his wife has been having a very public and obvious affair for more than ten years.
* Master Shake of ''WesternAnimation/AquaTeenHungerForce'' insists he is right on everything, especially when Frylock gives a simpler and more rational explanation. This is probably due to Shake being a {{Cloudcuckoolander}} and a complete {{jerkass}} at the same time. Plus the near critical mass amounts of ImplausibleDeniability he contains.
* Clyde Crashcup in ''WesternAnimation/TheAlvinShow'' is a definitive example, claiming to have invented inventions that already existed, or being the first to discover things already discovered.
* ''WesternAnimation/TheSimpsons'':
** Though Lisa is very smart and knows stuff people don't already know, Homer and Lisa's argument at the dinner table in "Lisa the Vegetarian" has Homer calling his daughter a "barbecue-wrecking, [[TropeNamers know-nothing, know-it-all]]". She does have a moment of this in "[=MoneyBART=]". When Lisa becomes the manager of Bart's baseball team, she claims that there have been several women managers and lists some off like Terry Francona and Connie Mack. Nelson tells her that all of her examples are men, much to Lisa's shock.
** Homer also proves to know less than he boasts, particularly in the episode "Homer Goes to College," where he interrupts a professor's lecture on a proton accelerator; the teacher finally asks him to demonstrate because he ''must'' know so well how it works ... only for Homer to somehow cause a nuclear meltdown.
* Poe from ''WesternAnimation/RubyGloom'':
-->That was precisely what I was going to say myself.
** On the surface Ruby may seem like this, but she does indeed seem to know exactly what to say, but hold it back to let whoever the other person is think it's their idea.
* Patrick Star of ''WesternAnimation/SpongebobSquarepants'' would claim that Wumbo is a real word. He would also sagely detail the symptoms of Mad Snail Disease. He also knows that Spongebob is a zombie. [[spoiler:Needless to say, it was all a load of barnacles.]] Incidentally, as part of a BrickJoke, it turns out [[StrangeMindsThinkAlike Wumbo might have been a real word]] in Bikini Bottom, but one which fell into such disuse, only a old man like Mermaid Man can remember it (How Patrick knew about it is never explained). Then again, he is senile.
* Brian from ''WesternAnimation/FamilyGuy'' especially in the later seasons when he insists he's right about everything and pushes his beliefs to get everyone to take his side, and takes credit for ideas that weren't his in the first place and other times using them as an excuse in order to get into a woman's pants, as Quagmire put it:
-->"...you pretend you're this deep guy who loves women for their souls when all you do is date bimbos. Yeah, I date women for their bodies, but ''[[AtLeastIAdmitIt at least I'm honest about it]]''. I don't buy them a copy of [[Literature/TheCatcherInTheRye "Catcher in the Rye"]] and then lecture them with some seventh-grade interpretation of how Holden Caulfield is some profound intellectual. He wasn't! He was a spoiled brat! And that's why you like him so much - he's ''you''!"
* Stan from ''WesternAnimation/AmericanDad'' especially in The Most Adequate Christmas Ever, where he gets killed and fights his way up to God Himself in order to get brought back to life to save his family. As God points out, there's no better metaphor for "I know everything" than pointing a gun to God's head and insisting He's wrong.
** In National Treasure 4: Baby Franny: She's Doing Well: The Hole Story, Steve convinces Francine to prove her worth by solving one of the Millennium Prize Problems in mathematics. After an intense mathematics montage, Francine goes up to a professor at a college lecture and announces that she solved the Yang-Mills existence and mass gap problem. Her solution? The number 6. The professor informs her that the answer wouldn't be a number, but rather an entirely new concept in mathematics, and she frowns and walks away.
* ''WesternAnimation/TazMania'': Well-meaning and gregarious though he is, Mr. Thickley's assessment of his own expertise has absolutely no bearing on the reality of same. Also in the ''WesternAnimation/LooneyTunes'' canon: Wile E. Coyote (yes, he ''will'' speak sometimes; "Zip Zip Hooray" [[BreakingTheFourthWall breaks the fourth wall]] on this one).
* ''WesternAnimation/{{Rugrats}}''
** Angelica always claimed to know more than the babies and constantly filled their heads with false information. She frequently gives them wrong information intentionally, however, since she seems to get a strange kick out of tormenting them with her lies. Of course, more than once (like the chicken pox episode), something will happen that dupes Angelica into [[BelievingTheirOwnLies believing her own lies]].
** [[NoCelebritiesWereHarmed Dr. Lipschitz]] as well. He's apparently a famous child psychologist, whose books are read almost religiously by parents, Didi in particular... But in the one episode where he appears, he obviously has little to no experience when it comes to working with children. He even claims at the end of that episode that he'll have to revise all his works because of the experience.
* Cap'n K'nuckles from ''WesternAnimation/TheMarvelousMisadventuresOfFlapjack''. As an example, in "Careful What You Fish For" he convinces Flapjack that fish are a type of candy. After Flapjack licks the fish and says it doesn't taste like candy, K'nuckles 'explanation' is that this is because it's wild candy, not the store bought stuff Flapjack is used to.
* ''WesternAnimation/RockyAndBullwinkle'' had a regular spot called "Mr. Know-It-All" where Bullwinkle would demonstrate some skill for the audience, only to foul it up completely.
* Mayor [=McDaniels=] from ''WesternAnimation/SouthPark'' is well aware of the idiocy of the citizens, and looks down upon them for it. However, she rarely comes off as much smarter despite thinking she's a genius trapped in a town of morons. Indeed, she can often be just as dumb as the rest of them.
* In the ''WesternAnimation/RockosModernLife'' episode "Dear John," it's revealed that Bucky, the host of a popular do-it-yourself show actually doesn't do the work himself, but delegates it to [[ActuallyThatsMyAssistant his assistant]], [[GenderBlenderName Al]]. Bucky is apparently more of [[ExactWords "a visionary and a dreamer"]] than a doer. Also, he only seems to know how to create [[ToiletHumor bathrooms]].
* In ''WesternAnimation/{{Bordertown}}'', J.C. is this trope all over. At one point, he quotes a Robert Frost poem, but after no one interrupts him after the first line, he's forced to admit he doesn't know the rest.
* In ''WesternAnimation/TheVentureBrothers'', this is one manifestation of Dermott Fictel's SmallNameBigEgo. He claims that Certs mints can be used to make napalm. He claims he can play the guitar, but always finds an excuse not to. He claims [[AssShove inserting a lighter into your rectum]] is the best defense against aliens--and he actually does it. In most cases, he doesn't seem [[IgnorantOfTheirOwnIgnorance Ignorant of His Own Ignorance]]; he's just desperate to impress.
* In ''LittlestPetShop2012'', one episode had a groundhog visit LPS and teach the others nonsense like "Tree frogs are made of wood", and everyone except Russell believes him. Russell even lampshades the trope by saying "He's a know-it-all who doesn't know anything!"
* ''WesternAnimation/RenAndStimpy'': Despite Ren being the self-proclaimed smart one in the group, it has been shown in many cases that Ren himself is an idiot.