->''"He was so learned that he could name a horse in nine languages; so ignorant that he bought a cow to ride on."''
-->-- '''Creator/BenjaminFranklin'''

Contrasting with the GeniusDitz, who, while usually foolish, has one area in which they are absolutely ''brilliant'', we have the Ditzy Genius who, while very intelligent and talented in several or many areas, has absolutely nothing in the way of common sense, logic, wit or tact.

This can occasionally be shown as naïveté to the point of stupidity, and/or nigh-SuicidalOverconfidence/inability to see the danger in what they're doing. In any case, these characters end up landing themselves in trouble more often than not.

The primary difference between a Ditzy Genius and a GeniusDitz is that a Ditzy Genius has high general intelligence but is highly inept at something more mundane than their intellectual interests ([[NoSocialSkills social skills]], for example) or lacks common sense, whereas the GeniusDitz usually seems dumb or clueless but is in fact highly proficient in at least one fairly specialized skill or field of knowledge. Contrast also BookDumb, which is a character smart in mundane life but abysmal in everything academic.

In any TabletopRPG using TheSixStats, this kind of character-type will have high {{Intelligence}}, but low {{Wisdom}}.

Sometimes, this is a deliberate characterization decision made to give a highly intelligent character a FatalFlaw, or make them come across as [[IntelligenceEqualsIsolation weird]], or any number of other reasons. Other times, it happens entirely by accident because the writers keep tossing the IdiotBall to a character who's (perhaps only [[InformedAbility because we're told as much]]) supposed to be academically brilliant.

See also CloudCuckooLander or BrilliantButLazy, especially in cases where the character's intelligtence is largely {{informed|Ability}}. One of the standard Hollywood interpretations of a {{Nerd}}, the other two being the HollywoodNerd and the ExtravertedNerd. Very closely related to SmarterThanYouLook. Also compare AbsentMindedProfessor, who isn't foolish so much as forgetful. See also NoSocialSkills and SacrificedBasicSkillForAwesomeTraining.



[[folder: Anime & Manga]]
* ''Franchise/DragonBall'':
** Bulma from ''DragonBall'' is a prime example. While a mechanical genius and heir to a huge scientific corporation, she has absolutely no sense at all when it comes to dealing with danger. And yet somehow she gets the idea to become a treasure hunter. She gets only slightly better at this over the course of the series, in the sense that she doesn't walk headlong into danger without thinking first so much.
** It runs in the family, because her father, Dr. Briefs, is even worse--he's a genius in anything mechanical, but has absolutely no common sense.
* Lloyd in ''Franchise/CodeGeass''. Brilliant mecha designer, does not understand basic human interaction. The characters are shocked to hear that he is engaged. [[spoiler:It's an arranged marriage, since Lloyd is a Count. He was only interested in the match because of his fiancee's vintage GiantRobot]].
* Kirino Chiba of ''Manga/BambooBlade'' is frequently behaving in a ditzy, overexcited manner. She is also ranked 20th in her year at school. Not genius level, but highly respectable nonetheless.
* Miyako of ''Manga/HidamariSketch'' acts like she has a case of AttentionDeficitOohShiny, but her artistic and academic abilities are levels above the other characters--she's one of the few people who is BrilliantButLazy but not BookDumb. That said, her use of GratuitousEnglish is also quite terrible...
* In ''Manga/HayateTheCombatButler'', Maria and Nagi have both skipped grades and know multiple languages. When they are split up while on a train, Hayate is torn between protecting his master or staying with the maid until Hinagiku shows up for a [[BigDamnHeroes less-than-fully-heroic rescue]] because they are completely clueless about the world.
* Tenpou in ''Manga/{{Saiyuki}} Gaiden'' brilliant strategist, but seems baffled by everyday life and would probably be buried under a pile of books almost permanently if it wasn't for Kenren.
* TeenGenius Hattori Heiji from ''Manga/DetectiveConan''. He's a brilliant detective who always keeps on par with Shinichi's deductions, but can't for the life of him remember to call Shinichi "Conan" when they're in public (which shouldn't be that hard, since "Conan" was the first name Heiji knew him by). He also has a bit of a HairTriggerTemper, particularly when talking to his [[VictoriousChildhoodFriend childhood friend]] [[BelligerentSexualTension Kazuha]]. So much so that one [[http://www.fanfiction.net/s/3620272/4/An_Unprofessional_Opinion fanfiction]] diagnosed Heiji with Asperger's Syndrome in a fictionalized psych profile.
** The main protagonist, Shinichi Kudo, is introduced as an amazing detective, even given the nickname "The Modern Holmes". However, he is [[NoSocialSkills incredibly socially inept]], which was a major reason why he had little to no friends as a child, the sole exception being Ran.
* Tamaki in ''Manga/OuranHighSchoolHostClub'' is rather ditzy. He also has the second highest grades in his year without even trying, to the frustration of some.
* Harumi Kiyama in ''Manga/ACertainScientificRailgun'' is a very intelligent scientist, but lacks even the most basic shred of common sense. For example, her thought process when it's hot essentially comes down to "It's hot, therefore I should take off some clothes." The fact that she's doing this in public doesn't occur to her. She actually becomes the source of an Urban Legend about a "Stripper Lady" because of this.
* [[IncomingHam Black]] from ''Manga/PokemonSpecial''. Type match-ups, move accuracy, evolutionary lines, detailed information on every Gym Leader and Elite Four member (including their team line-ups), Black studied them all before going out on his quest ToBeAMaster. Pity he has NoSocialSkills and feels that it's appropriate to shout out his dreams to people who are quickly going deaf.
* Joshua Lundgren of ''Anime/GunXSword'' is one of the greatest mecha engineers in the world... and doesn't understand why women scream when a guy walks into the girl's bathroom.
* The title character of ''LightNovel/HaruhiSuzumiya'' is brilliant at most things she does, scoring incredibly high in all her classes and every sport she tries with minimal effort, but she utterly fails when it comes to anything that requires her to consider other people's points of view, like the movie she made. She thought it was brilliant; everyone else was... less enthused. At one point she fails to comprehend why [[DeathIsDramatic characters always die at the climax of a story]], and another time she complains that crabs didn't evolve softer shells so she could eat them easier. She also fails to realize that wearing a PlayboyBunny outfit at school would upset the teachers. And then there's her general InsaneTrollLogic, such as pointing out that Tanabata wishes will take years to reach their destination due to the speed of light delay, but expecting that Orihime and Hikoboshi will be able to ignore the lightspeed barrier because [[AWizardDidIt they're gods.]]
* [[GreatDetective L]] of ''Manga/{{Death Note}}'' is a Ditzy Genius (compared to [[GeniusDitz Misa Amane]]) as he was stated by the author of ''Death Note'' to be the most intelligent character in the series, and has enough idiosyncrasies and few enough social skills that he can barely interact. Generally hyper-competent, he tends to fail in normal conversations and interpersonal relations.
* Sanae Dekomori from ''LightNovel/LoveChunibyoAndOtherDelusions'' anime may be a CloudCuckooLander out of her [[{{Chuunibyou}} delusions]], but she's still the top student of her grade, to Yuuta and Shinka's utter surprise.
* Mikogami Hayato of ''Manga/{{Sekirei}}'' graduated from college before the age of 15, and is cunning enough to outsmart the resident ManipulativeBastard. On the other hand, he's a [[{{Keet}} hyperactive teenager]] prone to AttentionDeficitOohShiny moments. He treats the Sekirei Plan like a super-exciting game of ''Franchise/{{Pokemon}}'', and expresses the desire to transform the world into something out of a video game if he wins.
** BigBad Minaka Hiroto was also this, before he became TheWonka.
* In ''Manga/{{Yuyushiki}}'', Yui sees Yuzuko as this. She does do well in school, but as Yui points out...
-->'''Yui:''' ''[on Yuzuko's {{def|iedtrope}}ying SmartPeopleWearGlasses]'' She really is pretty smart. It's her ideas that are dumb.
* ''LightNovel/FullMetalPanic'' features captain Teresa "Tessa" Testarossa. She is a tactical and strategic genius who became a captain in the international anti-terrorist organisation ''MITHRIL'' by the age of 16 and personally designed the submersible carrier ''Tuatha De Danaan'' which she commands. She is also a lovesick teenage girl and (apart from her talent for swimming) generally clumsy and slightly awkward.
* ''Anime/GirlsUndPanzer'' gives us Miho Nishizumi. At first glance, she's shy, socially awkward, and usually clumsy. She is also an expert tactician and commander in the sport of Sensha-do/Tankery, due to being from one of the most prominent families in the sport. The only thing that sets Miho apart from her family is that Miho [[NoOneGetsLeftBehind values the safety and efforts of her team]] which clashes with her family's "win at all costs" belief.
* Yoshiko of ''Manga/AhoGirl'' is so stupid that calling her dumb as a rock would be an InsultToRocks and she has an attention span to match. However, she is a physical powerhouse, at one point single handedly taking out a gang of delinquents while under the mistaken belief they bad-mouthed [[TrademarkFavoriteFood bananas]], can learn difficult dance routines after observing them once, and is amazingly proficient at traditionally feminine tasks such as cooking.
* Laius, of ''Manga/DungeonMeshi'', is incredibly knowledgeable about monsters, a decent tactician, and a peerless fighter. He also once tried [[ExtremeOmnivore (successfully!)]] to eat AnimatedArmor.

* ComicBook/LoisLane: A woman whose [[IntrepidReporter journalistic brilliance]] is matched only by her total inability to recognize sneaking into the villain's lair alone and unarmed just ''might'' be dangerous. And her [[ClarkKenting inability to recognize her boyfriend's face]]. A RunningGag in both comics and other media is that she is also terrible at spelling, despite, again, ''her job being journalist.''
* The [[NotAllowedToGrowUp perpetually six-year-old]] Calvin of ''ComicStrip/CalvinAndHobbes''. An example:
-->'''Calvin:''' Hey Mom, did you know that gravity in outer space works as if space was a soft, flat surface? It's true. Heavy matter, like planets, sinks into the surface, and anything passing by, like light, will "roll" toward the dip in space made by the planet. Light is actually deflected by gravity! Amazing, huh? And speaking of gravity, I dropped a pitcher of lemonade on the kitchen floor when my roller skates slipped.
-->'''Calvin's mom:''' ''[cleaning up the mess]'' [[LampshadeHanging How can kids know so much and still be so dumb]]?
* Jason from ''ComicStrip/{{Foxtrot}}''. The kid always does his homework and gets incredibly high marks in school...yet will pull off incredibly dumb, and sometimes dangerous stunts, half the time just to torture his sister.
* Bart Allen, aka ComicBook/{{Impulse}} and later Kid Flash II. He's got an awesome PhotographicMemory and the ability to [[SuperSpeedReading super speed read]] an entire library ''in two hours''. He could rival [[Franchise/{{Batman}} Ora]][[ComicBook/BirdsOfPrey cle]] in terms of encyclopedic knowledge, but he's in [[CloudCuckooLander his own little world]] most of the time.
* A ''ComicStrip/{{Dilbert}}'' strip has the Pointy-Haired Boss interviewing a prospective job candidate:
-->'''Boss:''' Wow! You have three masters degrees and a [=PhD=]!
-->'''Interviewee:''' Yes, it's all very impressive, but interestingly, I have no common sense whatsoever.
-->'''Boss:''' That's not the sort of thing you should say during a job interview.
-->'''Interviewee:''' I don't see why not.

[[folder:Fan Works]]
* [[WesternAnimation/MyLittlePonyFriendshipIsMagic Princess Luna]] in ''Fanfic/{{Progress}}'' manages to be a brilliant leader, improving irrigation systems and the tax code and much more (not to mention being a [[PhysicalGod Physical Goddess]]), and [[HilarityEnsues set the microwave to 27 minutes when making popcorn]]. Being a FishOutOfTemporalWater helps.
* As revealed in the WhereAreTheyNowEpilogue of ''FanFic/TheNewRetcons'', [[spoiler: Robin Patterson becomes this: unable to live by himself, but was accepted into the physics program in a nearby university.]]
* ''Fanfic/FutariWaPrettyCureBlueMoon'' has [[SenseiChan Ami-sensei]]. She's constantly given to speeches about hope and justice, chasing a promotion she's not sure will ever arrive despite her best efforts, and is the laughingstock of the school, but she's a GadgeteerGenius who can build anything from a super-toaster to an elaborate trap for the local PantyThief to an interdimensional communicator.
* The ''FanFic/DoctorWhoovesTheSeries'' Doctor makes a show of being this, which is part ObfuscatingStupidity, part genuine unfamiliarity with the world he's found himself in, and part simply [[CloudCuckooLander him]].

* ''Franchise/StarTrek'':
** Brilliant physics-defying engineer in ''Film/StarTrek'', Montgomery Scott, a man so intelligent, he came up with trans-warp beaming. A man so stupid, he decided to test the thing on Admiral Archer's dog, and promptly got himself [[ReassignedToAntarctica Reassigned to Delta Vega]].
** The "other" Scotty broke Kirk and [=McCoy=] out of Enterprise's brig, bragging that he knew every inch of the ship-- then promptly hit a beam and knocked himself out.
* ''Film/ABeautifulMind'' has John Nash, a mathematics wiz who will actually go up to a woman and say, "I don't exactly know what I am required to say in order for you to have intercourse with me. But could we assume that I said all that. I mean essentially we are talking about fluid exchange right? So could we go just straight to the sex. "

* There is an old joke about a professor who, at a university formal dinner, helps himself to some peas using his hand. When he realizes what he's done, he excuses himself with "I'm sorry, I thought they were beans."
* Likewise, there's the old fable about Thales of Miletus, who was so busy studying the stars that he fails to pay attention to what's around him and falls down a well.

* Literature/JakubWedrowycz is literally a genius, but comes across as a {{Ditz}}y old bum due, in part, to [[BookDumb poor general education]] (three years of elementary school back in the 1910's), though ObfuscatingStupidity also comes in play.
* Michael Sevenson in the ''Literature/KnightAndRogueSeries'' manages to be TooDumbToLive after having gone through a university. His complete inability to tell even a partial white lie and his tendency to act without thinking (sometimes to the extent that ''he doesn't even that realize he's acted'' until after the fact), not to mention his tendency to ignore social norms, make it surprising whenever he shows that he does, in fact, posses intelligence.
* ''Literature/HarryPotter'':
** Luna Lovegood. She is a CloudCuckooLander almost to the point of ObfuscatingStupidity, but she pulls out one genius move after another when it counts.
** Ravenclaw House seems to favor these. The description on ''Pottermore'' states that one of its lesser-known values is eccentricity, and has graduated quite a few Ditzy Geniuses over the years.
* Leonard of Quirm is the most intelligent man on the ''Literature/{{Discworld}}''...and has absolutely no comprehension of human nature whatsoever. The Patrician finds conversations with him a combination of relaxing (since he doesn't have to watch what he says) and frustrating (since Leonard comes up with things like "Yes, I've invented an incredibly powerful war machine, but that's okay because no-one would ever use such a thing.") ''Discworld/{{Jingo}}'' has him repeatedly shocked at Nobbs and Colon's constant ideas of how to use his inventions to attack others.
* ''Literature/AubreyMaturin'': Both Jack Aubrey and Stephen Maturin have elements of this, in contrasting ways. Jack Aubrey is an highly successful naval officer (which requires technical and mathematical knowledge as well as strategic and leadership skills) as well as an amateur astronomer and musician, but has a tendency to make poor choices when on land, especially in financial matters. Stephen is a physican/scientist/spy BadassBookworm ''par excellence'', but is utterly hapless at sea and something of an eccentric {{Cloudcuckoolander}}.
* Creator/SimonaAhrnstedt gives us Beatrice Löwenström in her debut novel ''Literature/{{Overenskommelser}}''. She's a very intelligent young woman, when it comes to academical and intellectual pursuits. But man, does she make some lousy decisions! When she's bullied into an engagement with a man, who's like forty years older than her and treats women like dirt, she never asks for help from anybody, who might actually want to and be able to help her. She also gets drunk at her cousins's engagement party (which could have ended much worse than it did), trusts her sociopath cousin (she shouldn't have) and tries to seduce male protagonist Seth when she has just fallen off a horse and gotten injured (not the right time)!
* Another Swedish example is Indra Ingridsdotter, the protagonist of ''Röd måne'' by Elisabet Nemert. She's such a brilliant medicine woman that she eventually gets knighted by the queen. But she also has an extreme lack of common sense. She has casual sex with many different men...even though she lives in the 17th century, when casual sex was against the law. It's not until after a scorned ex-lover has her thrown into prison that she finally realizes how stupid she had been.
* The whole Peterkin family in the humorous children's novel ''The Peterkin Papers''. They are well-educated, creative, and in their way, resourceful, but fail at handling mundane problems on their own due to a combination of ComplexityAddiction and lack of common sense.

[[folder:Live-Action TV]]
* Justin Russo from ''Series/WizardsOfWaverlyPlace'' plays this trope pretty straight. He excels at academics but tends to have no common sense to the point that he seems to have the IdiotBall glued to his hands.
* In ''Series/TheBigBangTheory'' roughly 86% of the main cast (That's 6 out of 7) fit this trope. The initial quartet are all respected in their fields of research, but lack social skills and are [[ProudToBeAGeek unashamedly open about their love of comic books and sci-fi]].
** Sheldon Cooper may be a brilliant theoretical physicist, but is insufferably arrogant, eternally confounded by social conventions, and almost completely ignorant of pop culture outside the sci-fi genre.
** Raj is a gifted Astrophysicist, whose work is featured in scientific magazines, yet has a SickeningSweethearts relationship ''with his dog'' and in early seasons was incapable to talking to women unless he had alcohol inside him.
** Amy is a neurobiologist, again, excellent at what she does and again, hilariously inept at socializing. In spite of speaking a very deadpan tone of voice, she gets ''super'' excited when the other girls include her in their activities. Very rarely does a woman in her late twenties get that excited about being invited to a slumber party.
** This was Bernadette's original characterization in Season 3 and early Season 4. She's introduced as a microbiologist with an interest in physics as well (every bit Howard's intellectual equal) but also rather ditzy, seemingly oblivious, and unable to understand Howard's jokes. However the ditzy aspect of her personality was dropped, probably to differentiate her more from Penny, and was replaced by her aggressive nature and {{Tsundere}} traits.
** Howard Wolowitz has engineered a number of devices used on the International Space Station and was even invited up into space to install one of them. He is multi-lingual, able to speak in several languages including Mandarin, [[Series/StarTrek Klingon]], sign language and binary code... [[ManChild yet he still has his mother take him to the dentist, eats candy till he gets a bellyache like a nine-year old, once spent all his food budget on Pokemon trading cards]] and somehow thought it was a good idea to impress a girl by taking the Mars Rover for a joyride.
** Experimental physicist Dr Leonard Hofstadter, has the least outlandish quirks of the initial group and has a Ph.D from Princeton. However, his unloving upbringing has left him [[IJustWantToBeLoved extremely needy for validation and affection]]. [[TotallyRadical His attempts to look cool are hilariously inept]] (including the backwards baseball cap) and he once used the equipment from government funded laser experiment to build his own BatSignal.
* The Doctor in ''Series/DoctorWho''. He's eccentric, more than slightly manic, rarely compliments anyone's intelligence without mentioning his own, and has the ability to, without fail, sniff out and leap headfirst into any danger that his companion hasn't already stumbled into. Oh, and he's also a ridiculously competent Genius who's saved the Earth countless times, but that's nothing you'd be able to tell at first glance. Especially not if you're glancing at his [[InsufferableGenius sixth incarnation]]. Or [[TheWonka the Fourth]]. Or [[SophisticatedAsHell the Tenth]]. Or...[[TheNthDoctor any version]] of him, for that matter. But Six was especially bonkers. Eight had a definite case of AttentionDeficitOohShiny going on, too (as did Eleven, for that matter), both in the movie and the Literature/EighthDoctorAdventures novels:
-->'''Eighth Doctor:''' A meteor storm. The sky above us was dancing with lights. Purple, green, brilliant yellow. ''YES''!
-->'''Grace:''' What?
-->'''Eighth Doctor:''' These ''shoes''! They fit ''perfectly''!
* Reid from ''Series/CriminalMinds'' often qualifies, although he's working on it, in his odd Reid way. He's very good at numbers, statistics and abnormal psychology of all kinds, but no good at all, most of the time, at things like the unspoken rules of conversation and tact.
* ''Series/{{Bones}}'': Bones is intelligent for solving crimes and yet clumsy with social stuff... Because her understanding of human behavior is more intellectual than intuitive, she forms conclusions that make perfect sense in theory, but are flawed in practice because humans themselves are flawed. It was heartbreaking when she told Booth she was going to adopt a dog that had been trained as a killer, only for Booth to tell her that the dog had been put down, because her protestations that the dog shouldn't have been blamed were ''right''.
* Kurt Hummel from ''Series/{{Glee}}'' is very intelligent and a fluent French speaker, but prone to moments of ditziness, such as his belief boxes have four sides or his plan to feed the doves at [[spoiler:Burt and Carole's wedding]] glitter.
* Alex P. Keaton from ''Series/FamilyTies.'' He's a hypercompetitive straight A student and math genius who was doing his parents' taxes when he was five years old and advised his parents on mortgage rates when they bought their house. Yet in everyday activities he often proves completely incapable. His little sister frequently beats him in sports, he fails at things like building kites, cooking or fixing cars even with extensive directions.
* Carlton Banks from ''Series/TheFreshPrinceOfBelAir'' may be a book-smart and highly intelligent first-class high school (later college) preppy, but he is especially naïve and [[ManChild immature]], especially in later seasons, and on multiple occasions seems to be ObliviousToLove. These areas are his cousin Will's expertise and he is often forced to (whether he wants to or not) bail Carlton out of social situations where such happens.
* Sherlock from, well, ''Series/{{Sherlock}}''. Justified as Sherlock only keeps important information in his "hard drive", which does not include tact, common sense, or the idea of [[SesquipedalianLoquaciousness heliocentrism]]. John pretty much calls Sherlock this in one episode:
-->'''John:''' You know, for a genius, you can be remarkably ''thick''.
* Lloyd Lowry from ''Series/BreakoutKings'' has many elements of this.
* Prof. Hamilton on ''Series/LoisAndClark'' had discovered a way to clone dead people with all their old memories and personalities intact, as well as a way to alter personalities. So he brings back Al Capone, John Dillinger, and Bonnie and Clyde. [[WhatAnIdiot Naturally, they all escape and wreak havoc across Metropolis]]. Lois even called him out on it.
-->'''Lois:''' Hollywood's created a dozen versions of Frankenstein and you still didn't get the point.
* Alli Bhandari from ''Series/{{Degrassi}}'' is brilliant with math and science, an ace writer, and has a great memory. [[FatalFlaw However, she usually gets into bad situations based on her lack of people-smarts and street-smarts]].
* Philip from ''Series/KamenRiderDouble'' has access to all the knowledge of the earth and is quite smart in his own right, able to figure out many things that Shoutarou can't. However, due to a MindWipe and being trapped in a factory placidly taking orders for eleven years, he doesn't know things that most people consider rudimentary. When he happens upon a subject that he finds interesting (a place, a food, a type of dance...) he will obsessively look up everything he can about it, oftentimes dressing up in zany outfits or trying nearly-suicidal activities just because he can. Also, especially towards the beginning of the series, he has NoSocialSkills.
* RecurringCharacter Professor Pepperwinkle in ''Series/TheAdventuresOfSuperman''. Example: he brought his latest invention to show Perry White. It was an (untested) time machine. Perry didn't have time to look at it because he was busy with an Important Story involving a gangster who was about to turn himself in to The Authorities, and who was in his office at the time; so the Professor turned his time machine on and sent them all (himself, the gangster, Perry, Lois, Jimmy, and Clark) to prehistoric times. Success!...then he realized he didn't bring enough fuel to make a return trip.
* The Solomons from ''Series/ThirdRockFromTheSun'' are all advanced aliens who could make fools out of even the smartest human beings, yet, because they have never dealt with emotions before, they come off as utterly crazy and weird to everyone around them. Dick, in particular, is a pompous manchild who can't even teach a young girl to play hopscotch without turning it into an argument.
* Leo in ''Series/{{Leonardo}}'' is possibly the smartest person in the world, but is incredibly easy to manipulate due to automatically believing in people, much to the despair of his StreetSmart friends.
* Commander Data of ''Series/StarTrekTheNextGeneration'' represents the pinnacle achievement of robotics and is very likely the most intelligent officer in all of Starfleet. He is also routinely stymied by basic human interaction and language.
-->'''Chief O'Brien:''' ...We'll be burning the midnight oil on this one.
-->'''Data:''' [[ComicallyMissingThePoint That would be inadvisable]]...If you ignite a petroleum product on this ship at zero-hundred hours, you will activate the fire suppression system, which would seal off this entire compartment.
-->'''O'Brien:''' That was just an expression.
-->'''Data:''' Expression of what?
-->'''Data:''' It appears we will be required to ignite the midnight petroleum, sir.
* Moss from ''Series/TheITCrowd'' is an extremely book smart technological genius, with NoSocialSkills and a rather absurd lack of common sense. When a fire broke out in his office, for instance, his reaction was to send a carefully worded E mail to the fire department, then sit there and wait for them to respond.
* ''Series/TheWaltons'': Jim Bob. He's really smart, just [[BrilliantButLazy lazy]].
* Lulu from ''Series/TrueJacksonVP''.
* Screech from ''Series/SavedByTheBell'' is an academic genius, but can barely function in the real world. [[{{Flanderization}} It got worse over the years]].
* Winifred "Fred" Burkle in ''Series/{{Angel}}'' may qualify. She's a skittish, timid, socially-awkward girl, exacerbated by her imprisonment in another dimension where she was viewed as little more than cattle for several years, to the extent she verges on {{CloudCuckooLander}} (at least in earlier seasons). She also happens to be a quantum physicist of near-genius intellect.
* Lord Edmund Blackadder from the second season of ''Series/{{Blackadder}}''. A transitional Blackadder, having gained a lot of cunning and suave that would grow with each of his predecessors, but still having some blithering, pitiful shades of the previous Edmund.
* ''Series/StarTrekVoyager'': Ensign Harry Kim is a brilliant scientist and engineer, but also hopelessly inept when it comes to relationships to the point that he can't even get laid in his own holodeck simulations, and no con is so obvious that he won't fall for it hook, line, and sinker.
* The title character of ''Series/AdamRuinsEverything''. He's an expert in just about every subject matter there is, but is absolutely terrible at predicting how people will react to things. For instance, in "Adam Ruins Security", he needs to have it pointed out to him that going on live TV and giving serial killers advice on how to get around common security systems might have unintended negative consequences.
* The titular character of Series/MalcolmInTheMiddle maybe have an IQ of 165, but he has the judgement of a drunk squirrel. To name a few showcases: he tanked his grades and got caught trying to drink underage just to impress a rather unintelligent girl, tried to crash his mother's car into his father's car to get sent to military school after he had been embarrassed the previous day, crashed his go kart into Reese's for revenge for stealing his birthday money causing them to get both hospitalized and grounded with Dewey getting Malcolm's only birthday present, tried to dispose of a loaded gun rather than calling the cops, and held a pair of open scissors near his face right as Reese popped a balloon.
* Mrs. Howell from ''GilligansIsland'' is this crossed with RichInDollarsPoorInSense. She's quite intelligent in a number of ways, is apparently second to [[OnlySaneMan the Professor]] in terms of formal education (though her expertise lies more in art and culture), and is a source of motherly wisdom, but lacks basic sense and can act pretty scatterbrained at times.

* Dr. Shaw in ''Roleplay/DinoAttackRPG'' is a very intelligent and capable surgeon and even shows some talent as a counselor. On the other hand she's extremely unstable psychologically and spends a lot of time praying to a being she only half-believes in.

* This Trope pretty much defines Tinker Gnomes, an offshoot of gnomes who appeared in the ''TabletopGame/{{Dragonlance}}'' and ''TabletopGame/{{Spelljammer}}'' settings. They're curious creatures who love to build, study, and improve mechanical devices, but ar often careless and foolhardy, and often go ''way'' overboard, creating weird and nutty inventions (or blowing themselves up). Justified, of course, because they are a divinely created species cursed with ScienceRelatedMemeticDisorder, which outright compels them to go about creating devices in the most ridiculously complicated and unlikely manners possible, to the point they are the number one cause of FantasyGunControl in-setting. (Game-wise, Tinker Gnome [=PCs=] start with a +2 bonus to Intelligence Scores but a -2 penalty to Wisdom, making them smart, but lacking common sense.)

[[folder:Video Games]]
* ''Franchise/SonicTheHedgehog'': Dr. Ivo "Eggman" Robotnik is a genius who [[ImprobablyHighIQ has an IQ of 300]], capable of singlehandedly building entire fleets of airships and space stations as well as armies of killer robots. However, he usually dresses his machines in garish colors, tends to throw temper tantrums whenever he's on the losing side and has a tendency to paste his face on everything. In addition to almost always including an incredibly obvious weak point in all of his robots (which is not unusual or unexpected for video game villains), special mention must be made of the [[VideoGame/ShadowTheHedgehog Egg Dealer]]--a slot machine robot that had a random chance of attacking himself or even giving Shadow immediate access to his ultimate technique. Got to wonder what he was thinking when he programmed those particular features in.
* Rita Mordio in ''VideoGame/TalesOfVesperia''. A prodigy mage at the age of fifteen, but possessing absolutely no social skills. She's rude, direct, [[DisproportionateRetribution violently assaults those who bother her]] and cares nothing for other people. This can be chalked up to her young age and that she was raised (as an orphan) in a university town filled with self-absorbed scientists.
* Pascal in ''VideoGame/TalesOfGraces'' is a lot more sociable than Rita, but she's so energetic that she's nigh-incomprehensible when she gets excited, and she can't read social situations: she doesn't so much break the tension in a room as much as crash through it head-first. She also has no concept of personal space.
* Harold from ''VideoGame/TalesOfDestiny2'' is an eccentric, unpredictable, childish and sometimes downright psychotic young lady; yet, she is the genius behind the creation of the [[EmpathicWeapon Swordians]], and a magic expert. The writers of Vesperia seem to have taken a bit of her when making Rita; theory supported by a Harold mask usable by her (as an Attachment) and her Miska Doctoral Degree costume title, very reminiscent of Harold's garment.
* [[Franchise/SuperMarioBros Luigi]] may qualify for this. [[VideoGame/SuperPaperMario When he's turned evil]], he manages to build a giant killer robot that takes over two hundred hits with an alien space laser to go down in a couple of hours, owns his own airship (that he's implied to have built himself), is a master at card games, is explicitly stated to be the brains of the brothers, when Mario has a job which already requires someone to be very smart, and, yet, acts extremely childish when he's on adventures.
* Merrill of ''VideoGame/DragonAgeII'' is a brilliant mage and historian well noted for her talents. She's also extremely naïve, very socially awkward, has little in the way a common sense (for some time she considered muggings to be some form of greeting), and an absolutely abysmal sense of direction. This is both played for laughs and treated seriously.
* [[VideoGame/TeamFortress2 Medic. Oh, Medic]]. He may look like [[GermanicEfficiency he has it fairly together]] on the field, but look a little closer and [[MadScientist you'll]] [[MadDoctor find]] [[ScienceRelatedMemeticDisorder out otherwise]]. For example, he apparently believes that the best way to talk to a patient during surgery (the patient being his HeterosexualLifePartner, no less) is to regale him with the story of how he lost his medical license (it involved removing the entire skeleton from a man who lived to tell the tale). It's fairly obvious that the man is both socially inept and generally round the twist.
** Australium poisoning has this and TestosteronePoisoning as its main effects. Radigan Conagher (Engie's grandfather), after working with australium for years, became intelligent enough to make a fully functional prosthetic limb, and dumb enough to saw his hand off to be able to use it, and Australia, the main source of this metal, is the most advanced country in the entire world, yet they elect their king by kangaroo boxing.
* The Sophon's of ''VideoGame/EndlessSpace'', they're just as likely to run away screaming from a planetary anomaly or study it despite being irradiated.
* Yukiko Amagi of ''VideoGame/{{Persona 4}}'' has a bit of this. Intelligence-wise, she's very smart, as her best friend Chie remarks that Yukiko always ranks near the top of the school charts when it comes to exams, and she's also often the one to make important deductions about the murder case the group is working on (up until [[KidDetective Naoto]] joins the group, anyway). On the other hand, she's capable of being very air-headed too, often displaying a remarkable ability to miss the entire point of a conversation (for instance, not knowing that a guy asking her to "go somewhere" with him was asking her out on a date, or thinking Yosuke is making a dirty remark when he suggests Yukiko give him some "private lessons" during a conversation about studying), and occasionally spaces out completely when others are talking to her.
* Lamia Loveless in ''VideoGame/SuperRobotWarsAdvance'' is a completely competent SuperRobot pilot - calm, analytical and deadly in battle. During her normal life, however, she tends to act ditzy. This is {{justified|Trope}}, since she is a RidiculouslyHumanRobot who was created mere years ago, and had only recently discovered what it felt like to be human.
** Yong Gebana of ''VideoGame/SuperRobotWarsOriginalGeneration: Dark Prison'' has a seemingly serious personality when it counts and apparently operates "by the book" most of the time. She has a slight obsession with data, which is represented by how she acquires and utilizes data constantly when in actual combat (Her debut chapter is called "Auditor Girl", referencing this). She has some slight "ditz" moments at times and we are usually shown her self monologues on which she usually "assorts" the current situation when she doesn't get something.
* Kiel of ''VideoGame/RuneFactory4'' takes great joy in reading books and learning about all sorts of things. However, he apparently failed to grasp the basic concepts of secrecy, deceit, or even just being a prankster, because he takes ''everyone's'' words at face value and can't keep anything in confidence--not that he deliberately goes around telling people, mind you; he just tends to let things slip when he shouldn't. He's also naïve and inexperienced in the real world, despite his vast reading list.
* Morgan from ''VideoGame/FireEmblemAwakening'' is [[spoiler:the player character's son/daughter and, much like their parent, is]] a BadassBookworm [[spoiler:with a love for tactics and Easy Amnesia]]. While it's clear from Morgan's thought processes that they're very intelligent, the issue is that, despite appearing to be [[VagueAge anywhere from fifteen to their early twenties]], Morgan spends a lot of time [[ItMakesSenseInContext literally bashing their head against posts]], asking bandits [[EvenBadMenLoveTheirMamas if their mother would be proud of them for their actions]] ([[SubvertedTrope it doesn't work]]), and other similar actions. It becomes obvious Morgan lacks of lot of common sense and is very naïve, and their [[spoiler:amnesia]] probably doesn't help matters, either.
* In the ''Franchise/KingdomHearts series'', particularly high magic potential seems to be tied to intelligence, with characters like Zexion and Aqua showing high aptitude in magic. The character with the ''highest'' magical potential in the series? ''Donald Duck'', who isn't just a mage, but also a powerful wizard. He's also, well, Donald Duck, with all his usual stubbornness and lack of common sense.

[[folder:Visual Novels]]
* The writers of ''VisualNovel/{{Tsukihime}}'' were apparently quite aware that the average reader was likely to dismiss Arcueid as an idiot. In truth, she's actually very intelligent and knowledgeable, she's just never had to pick up the skills that Shiki takes for granted. Which she points out. Plus, she's still a ditz.
* Kotomi Ichinose in ''VisualNovel/{{Clannad}}'' regularly tops or at least places in the top ten of national grade/test averages and studies incredibly advanced physics in her spare time. She also doesn't seem to see much of a problem with using scissors on any science book [[spoiler:that mentions her parents or their work]] and reacts...very...slowly...to things, plus [[CloudCuckoolander many]] [[TheWonka similar]] traits that become more obvious with time. Watching her "''tsukkomi'' lessons" with Kyou and Nagisa can be both FacePalm-inducing and hilarious.
* Mitsunari from ''VisualNovel/IkemenSengoku'' is a brilliant military strategist who's also [[BadassBookworm quite skilled in reading and swordmanship]]. However, he also is something of a lovable doofus (albeit an [[NiceGuy extremely sweet]] and [[{{Bishonen}} pretty]] one) who [[TheKlutz regularly spills tea while trying to make it]], is [[DoesNotUnderstandSarcasm blissfully oblivious]] to [[DeadpanSnarker Ieyasu]]'s attempts to insult him and [[ObliviousToLove anything related to romance]], and frequently [[ForgetsToEat forgets to eat]] while caught up in his reading and the [[AccidentalMisnaming names]] of people he isn't close friends with.
* Merja in the first ''VisualNovel/ParascientificEscape'' game is a fifteen-year-old super hacker who also has a tendency to let her mind wander.

[[folder: Web Animation]]
* So and So from ''WebAnimation/TeenGirlSquad''. She gets straight A's and prides herself on being an academic overachiever, yet is utterly devoid of anything resembling common sense.

[[folder:Web Comics]]
* Molly in ''Webcomic/TheInexplicableAdventuresOfBob'' is an OmnidisciplinaryScientist with the personality of a child. Also Galatea, although these days Golly does a better job of at least ''looking'' worldly-wise, even if she's still incredibly naïve.
* Palma from ''Webcomic/MushroomGo.'' She's an immature, loud mouthed teenager with a short attention span and poor grammar. She may also be the smartest [[VideoGame/SuperMarioSunshine Pianta]] in the world, and has spent most of her life lost in books.
* Brandi of ''Webcomic/WapsiSquare'' is beyond brilliant when it comes to planning, to the point where any unusual coincidence that worked to the favor of the protagonists can be attributed to her manipulations. She also fails to realize that flies drown when she flushes them down the toilet (she couldn't just shoo them outside because it was winter in Minnesota, and they would quickly freeze to death).
* In ''Webcomic/{{Sakana}}'', Taisei is incredibly smart and a talented {{salaryman}}. He's also incredibly silly and childish (but [[LoveYouAndEverybody well-meaning]]).
* Link is this in ''Webcomic/NintendoAcres'': Competent at being the hero of ''Franchise/TheLegendOfZelda'' games, has an incredible knowledge of literature, and can't open a door without using a bomb or boomerang.
* Brian Fitzpatrick in ''Webcomic/{{Rhapsodies}}'' is a gifted polymath, economist and accountant who can pretty much make numbers do what he wants. He is however impulsive with an extremely abrasive personality and is so socially clueless most people think he's an idiot.
* Fortiscue from ''Webcomic/CommanderKitty'' has shades of this. He has numerous amazing scientific accomplishments to his name, but between [[http://www.commanderkitty.com/2012/07/22/welcome-to-the-machine-2/ insisting that only the portable hard drive can be moved]] and [[http://www.commanderkitty.com/2012/11/04/plan-a/ mistaking CK for a janitor after a costume change even though they've been talking for the last few pages]], one has to wonder where exactly the little sheep's head is...
* Otacon from ''Webcomic/TheLastDaysOfFoxhound'', in a {{Flanderization}} of his original appearance in ''VideoGame/MetalGearSolid''. An engineering genius who designs and builds a walking stealth deathtank capable of firing untraceable projectiles from almost any location, but so naive that he believes it'll be used solely as a missile ''defense'' platform.
* ''Webcomic/TheOrderOfTheStick'':
** Celia unites the Azure City resistance, saves Haley from murderous rogues twice using only words and quick thinking, and even wins a complicated [[spoiler:albeit rigged]] court case while still a law student, but [[http://www.giantitp.com/comics/oots0529.html lacks basic knowledge]] of how humans work and [[http://www.giantitp.com/comics/oots0574.html doesn't suspect]] that someone dragging a corpse through a WretchedHive might not have pure intentions.
** The elf priestess Veldrina is a personable, articulate, MagiBabble-spouting genius. She's also completely trusting of strangers, bewilderingly LiteralMinded, and so bereft of common sense as to [[AdmiringTheAbomination tickle a vampire's chin]].

[[folder:Web Original]]
* Delta Spike from the Literature/WhateleyUniverse is a prime example: a GadgeteerGenius who is especially well known on campus for the catastrophic explosions her devises cause when they inevitably fail, she tends to assume that everything will work perfectly and doesn't consider consequences. As one character put it, "She knows A plus B will equal C, but she fails to consider that there's a D, E, and F."
* [[VideoGame/HalfLife Gordon Freeman]] as depicted in ''Machinima/FreemansMind'' is a narcissistic, [[TheFool bumbling]], [[BrilliantButLazy lazy]], [[CloudCuckoolander and overall bizarre]] human being who, among other things, built pillow forts out of plaster when he was a kid, got mad at zombies for not answering his questions, thought his mailman was spying on him, and stayed up for three days straight when he thought his house was being invaded by frog people. Some of his interactions with the scientists also show him to pretty inept and overall [[{{Jerkass}} dickish]] socially, and he's implied to go on drinking binges regularly as well as [[TheStoner get high on whatever's available.]] However, his inner monologues show that, despite all of this, [[CrouchingMoronHiddenBadass he's quite competent in combat]], is [[BunnyEarsLawyer actually very knowledgeable about theoretical physics]], speaks at least five languages (Haitian Creole, Spanish, German, Hindi and English), and has proven consistently more competent both physically and mentally than anyone else in Black Mesa (though Gordon at one point notes that his competence isn't so much him being smarter than everyone else but the rest being so stupid it veers into TooDumbToLive).
* In ''WebVideo/DeathNoteTheAbridgedSeriesKpts4tv'' [[EvilGenius Light Yagami]] is characterized this way:
-->'''Light:''' ''[[BigOMG Oh my God]]'' I forgot my death note!
* ''Website/SFDebris'': Parody Janeway. On the one hand, she's a brilliant, if [[CardCarryingVillain malevolent]], engineer with a gift for [[MadScientist mad biology]]; on the other, she is remarkably prone to blundering into obvious danger and otherwise making disastrously bad decisions.
* Doctor Javolt from ''Podcast/FalloutIsDragons'' can pull off incredible feats of technological and (reluctantly) magical prowess...when he's not too busy misinterpreting every social interaction of those around him and being an annoying large ham.
* Tiberius Stormwind from the ''WebOriginal/CriticalRole'' D&D show is played like this, fitting for a character with a very high Intelligence stat but a Wisdom of ''4''. (To put that in perspective, the team's DumbMuscle has an Intelligence of 6) As a result, Tiberius is a brilliant spellcaster and a genius in all arcane matters, but has zero common sense. In one episode, he responds to to an account of someone "stepping of a few toes" with "Oh, was she clumsy?" He's essentially the magical equivalent of an AbsentMindedProfessor.

[[folder:Western Animation]]
* ''Franchise/XMen'':
** Forge is portrayed this way in both ''WesternAnimation/XMenEvolution'' and ''WesternAnimation/WolverineAndTheXMen'', though in the latter it's more a case of BrilliantButLazy, while in ''Evolution'' he's energetic and brilliant, but somewhat foolish and lacking in foresight.
** Shadowcat from ''WesternAnimation/XMenEvolution'' also qualifies. She's portrayed as a very intelligent student, but could be easily excited over "typical" teenage topics (driver's license) and early on had the tendency to use the word "like" so much in a single sentence, [[Franchise/ScoobyDoo Shaggy Rogers]] would probably take notice.
* ''WesternAnimation/WileECoyoteAndTheRoadRunner'': Wile E. Coyote is a genius capable of building roadrunner traps, [[CutLexLuthorACheck but, if you think about it, wouldn't it be much easier if he just ordered food instead of ordering a bunch of supplies from ACME]]? Alas (for him, at least), he's simply too stubborn to give up.
* ''WesternAnimation/TheLoudHouse'': Among the eleven kids, we have second youngest child (and daughter) Lisa Loud--at only four years old, she's already finished school up through getting a PhD, she gives university lectures, she has at least one Nobel prize and she also [[ArsonMurderAndJaywalking helps her parents do taxes and pay bills.]] But for all her accomplishment in book smarts, she's a bit lacking in mundane sense. She fails to see why experimenting on a fifteen month old baby would be a bad idea and very few of her experiments have actually worked without ultimately and/or having some kind of weird side effect. She's basically [[WesternAnimation/DextersLaboratory a female Dexter in this regard]].
* ''WesternAnimation/TheMightyB'': Bessie Higgenbottom can do anything that will earn her a badge--including creating cold fusion or building a working robot with limited AI--but that doesn't make her any less of a ditz.
* Minor ''WesternAnimation/{{Daria}}'' character [[GuyOfTheWeek Ted]] fits this trope. [[HomeschooledKids He was homeschooled]] for most of his life, which gave him both an EncyclopedicKnowledge of everything and a ditzy lack of social skills.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic''
** Twilight Sparkle: A unicorn so smart, she knows most of the constellations by heart and is able to finish a race fifth place, ahead of a few dozen other, more athletic horses, simply by using her book smarts. She's also a filly so silly, she needs to consult a reference book on something as simple as a sleepover. She even reads the book to find out what to do ''when a tree falls into her house'' instead of just getting up and helping move it. There's also the fact that [[HyperCompetentSidekick her dragon roommate, Spike, does most of the housework]] (he ''loves'' his job, though, so he's not complaining too much). While Twilight is able to take care of her own for short periods, Spike is ''way'' better than her at it and a few episodes imply that Twilight would be completely screwed if Spike wasn't involved in her life.
** Pinkie Pie: Ponyville's resident sapient pile of [[FunPersonified glitter and frosting,]] who nonetheless has a PhotographicMemory concerning her (literally thousands of) friends' tastes in parties. Also built a pedal-powered helicopter and a functional cannon[[note]]it shoots intact party supplies instead of lethal shells, [[UpToEleven which is probably an even greater accomplishment]][[/note]] and has preternatural senses regarding danger.
* The third season of ''WesternAnimation/GeneratorRex'' gives us Cesar Salazar, the formerly absent older brother of the eponymous Rex. Among his many achievements are: Working on the nanite project alongside his and Rex's parents, building a mobile lab capable of traveling at relativistic speeds, sauntering into Providence and casually neutralizing everyone between him and his kid brother, and [[spoiler: creating the [[AIIsACrapshoot insane AI, ZAG-RS]], which has nearly succeeded several times in [[ApocalypseHow destroying all life on Earth.]]]] When not performing feats of scientific awesomeness, however, it's clear that, against all logic, ''[[BunnyEarsLawyer Rex]]'', not known for being the smoothest guy around, got all the social skills in the family.
* Gadget from ''WesternAnimation/ChipNDaleRescueRangers''. She can make almost everything from almost anything, including rebuilding a plane out of garbage, but she simply does not register that in certain circumstances, certain behaviors are socially necessary or unusual.
* Dr. Drakken and Professor Dementor from ''WesternAnimation/KimPossible'' constantly produce [[MadScientist spectacular world-menacing gadgets]], but can't stop a couple of teenagers from [[FailureIsTheOnlyOption foiling their schemes]].
* Brain from ''WesternAnimation/PinkyAndTheBrain''[=/=]''WesternAnimation/{{Animaniacs}}'' regularly produces plans that are ingenious and lack any kind of common sense. He also often screws up his own plans when he lets his anger at Pinky distract him and forgets some essential part of his plan.
* Jack Spicer from ''WesternAnimation/XiaolinShowdown'' is incredibly incompetent not only as a villain but also virtually everything he had done to the extent that the other characters tend to forget that he really ''is'' a genius who can create robots from scratch.
* Roba from ''WesternAnimation/TheProblemSolverz''. He's the smartest member of the team, is knowledgeable about many subjects, and has built his own radar scanner. However, he's also very socially inept and childish.
* ''WesternAnimation/PhineasAndFerb'': Heinz Doofenshmirtz. He's a genius when it comes to science, technology, math, and engineering, but he lacks just about everything else such as social skills and common sense. He puts self-destruct buttons in a convient location on just about every invention he builds, and he's never even recognized his nemesis, Perry the Platypus, in even the most transparent of disguises, and tends to assume Perry is just an ordinary platypus if he's not wearing his trademark fedora. To put all this into perspective, take his scheme in the episode "Fireside Girl Jamboree": He was smart enough to build a machine that is capable of transforming metal into broccoli (A ''mineral'' into ''living matter''), but decided to make it ''out of metal''.
%%* The title character of ''WesternAnimation/ScaredySquirrel''.
* ChildProdigy Dexter from ''WesternAnimation/DextersLaboratory'' definitely fits the bill. He's able to time-travel, create robots, and build portals to other dimensions, but is utterly incapable of taking care of himself for a single day when his mom is sick. He doesn't know how to cook (having never heard of "flour"), and, as for cleaning...
-->'''Dexter:''' [[MundaneObjectAmazement Could this strange phenomena be the substance Mom calls DUST]]?
** In the episode where he gets chicken pox, he ''has no idea what chicken pox even is.''
* Mojo Jojo from ''WesternAnimation/ThePowerpuffGirls'' lives and breathes this trope far too often. Despite his high intelligence, Mojo is [[DidntThinkThisThrough extremely inept at planning his schemes with major detail and they predictably end in failure]]. A blatant example of this is in the episode "Monkey See, Doggy Two" where Mojo shows the girls the video of how his plan to turn every citizen in Townsville into dogs failed. So after turning the girls into dogs, the dog-transformed Buttercup runs around and bites him from behind, causing him to drop the Anubis (which he used to transform dogs) onto his head, breaking it. He tells the girls than his plan won't fail this time because he won't turn them into dogs, neither of them will bite him (since he has his rear covered with steel), and he won't drop the Anubis. All this and he forgets the fact that the girls can still beat him up, which they predictably do, causing his plan to fail even worse than it did before.
** Professor Utonium is also like this to a certain degree. Pretty much everything useful he's invented, including the girls themselves, he's done so by accident. If that's not enough, whatever he set his mind to do something intentionally, he tends to create disasters. (The episode "Uh Oh, Dynamo" is the best example.)
* Zim from ''WesternAnimation/InvaderZim'' is a scientific genius among races of scientific genius. He can build time machines, enhance elite positioning systems (to the point that GIR could point out individual exoplanets while indoors), mutate small house pets into kaiju-like monsters, slow down objects (including explosions) in time and space, hack into the Massive, and much more. However, he is still one of the least competent Invaders. Zim has little enough common sense to attack ''his own planet'' with a battle mech, commandeer a gargantuan maimbot to break open a faulty vending machine, accelerate a temporally slowed explosion ''before'' the Almighty Tallest would examine his operation (even [[TheDitz GIR]] realized that this was a bad idea), and uses [[PaperThinDisguise paper-thin disguises]] for himself, GIR , and his base. He's lucky that most humans are too idiotic to notice that he's an alien, or else he would have been discovered literally minutes after arriving on Earth.
* Plankton in ''WesternAnimation/SpongebobSquarePants''. Despite being an evil genius, he tend to over look simple things, which his computer wife Karen has to point out. Like that the alphabet ends with "Z", and he doesn't remember how to blink. He's able to make so many amazing inventions that not even ''humans'' can come up with, yet how does he decide to get money? ''By selling human resources at a dingy restaurant''. And in "Goo-Goo Gas", he thought that baby powder was actually ''made'' from babies.
* Professor [=MacKrill=] from ''WesternAnimation/HelpImAFish''. He's a highly intelligent scientist who created a potion that can be used to turn other living beings into fish and vice versa. He easily forgets things and often makes up songs to help him remember.
* Dick Dastardly from ''WesternAnimation/DastardlyAndMuttleyInTheirFlyingMachines'': He's skilled at mechanics and can build almost anything. But that's about all. He never plans ahead and spends his whole life trying to CatchThatPigeon.
* Tecna from ''WesternAnimation/WinxClub''. She's the smartest of the group when it comes to technology and science, but she can be absolutely clueless when it comes to anything unrelated. Early on in the show, she referred to a mop and bucket as "primitive devices". Flora had to guide her in using them, but wasn't specific enough, which made Tecna utilize the bucket as a helmet and the broom as an elongated feather duster.
* Jeanette from ''WesternAnimation/AlvinAndTheChipmunks''. She's very well-read and book-smart, but otherwise lacks common sense and general intelligence, such as putting her shoes on the wrong feet, holding signs upside-down, walking into doors or walls, tripping over untied shoelaces, falling down the stairs, etc.
* Kevin French in ''WesternAnimation/MissionHill'' is this. He's absolutely ''brilliant'' in school, but so socially inept that it does him little to no good. Ironically he's forced to rely on his StreetSmart but BookDumb older brother to deal with pretty much any real life scenario.
* Jenny ([=XJ9=]) from ''WesternAnimation/MyLifeAsATeenageRobot'' is a highly advanced and intelligent combat android. But she's pretty clueless and naïve when it comes to mingling with non-robotic teens (other Brad or Sheldon).
* ''WesternAnimation/CampLazlo'': Although Clam is able to create an exact copy of the Mona Lisa in 30 seconds, play an entire symphony by blowing across the top of a bottle, and construct a gigantic Segway-like machine out of a tree trunk, it's quite evident [[CloudCuckoolander his worldview is very odd]]. Most of the cast does not recognize his genius at all, usually passing him off as TheDitz due to said oddness.
* In a milder version of the trope, Chloe Park from ''WesternAnimation/WeBareBears'' is a child prodigy who is grade-school aged but attending college. She has shown to be pretty smart and self-suficcient, but still takes rash decisions that can land her in dangerous situations (entering the cave of the titular bears to get information for a report or climbing into the habitat of an albino aligator because she promised Ice Bear they would see it).
* Quack Quack from ''WesternAnimation/{{Kaeloo}}''. When it comes to science, math and the like, he's absolutely brilliant. And yet, he couldn't figure out that a picture of himself with Stumpy's head taped onto it wasn't a picture of Stumpy.
** [[RobotMaster Olaf]] the emperor penguin counts as well, as he has built his own DoAnythingRobot, [[spoiler: an army of MechaMooks]], a freeze ray, and [[spoiler: turned Stumpy into a {{Cyborg}}]], but he is otherwise a complete idiot.
* Jet Propulsion from ''WesternAnimation/ReadyJetGo''. He is an expert mechanic, and can name every single one of Jupiter's moons, yet he is incredibly naive about Earth culture and can't keep his alien identity a secret.

[[folder:Real Life]]
* There's a Dutch saying: "Krankzinnigheid ligt dicht bij begaafdheid". Translated, this means (approximately) "craziness is close to genius".
* The English-speaking world has a few similar sayings: "there's a fine line between genius and insanity"; "genius and madness are two sides of the same coin"/"... go hand in hand"; etc...
* [[http://en.wikipedia.org/wiki/Kurt_Godel Kurt Gödel]]. He was an outstanding and truly deep-thinking logician and mathematician by whom UsefulNotes/AlbertEinstein was very impressed. He also very nearly failed his U.S. citizenship exam by blithely announcing that he had found an inconsistency in the U.S. Constitution which made a dictatorship possible. He wouldn't eat anything cooked by strangers--when his wife was hospitalized for six months, he was unable to figure out how to cook for himself. He eventually died of starvation.
* Anthony Weldon referred to King James I of England/VI of Scotland "the wisest fool in Christendom"[[note]]The full quote is "A very wise man was wont to say that he believed him '''the wisest fool in Christendom''', meaning him wise in small things, but a fool in weighty affairs"[[/note]].