->'''Man in Theater Line:''' Wait a minute, why can't I give my opinion? It's a free country!
->'''[[Creator/WoodyAllen Alvy Singer]]:''' He can give it... do you have to give it so loud? I mean, aren't you ashamed to pontificate like that? And the funny part of it is, Marshall [=McLuhan=], you don't know anything about Marshall [=McLuhan=]!
->'''Man in Theater Line:''' Oh, really? Well, it just so happens I teach a class at Columbia [University] called "TV, Media and Culture." So I think my insights into Mr. [=McLuhan=], well, have a great deal of validity!
->'''Alvy Singer:''' Oh, do ya? Well, that's funny, because I happen to have Mr. [=McLuhan=] right here, so, so, yeah, just let me...
->[pulls [=McLuhan=] out from behind a nearby poster]
->'''Alvy Singer:''' Come over here for a second... tell him!
->'''Marshall [=McLuhan=]:''' I heard what you were saying! You know nothing of my work! You mean my whole fallacy is wrong. How you got to teach a course in anything is totally amazing!
->'''Alvy Singer:''' Boy, [[WishFulfillment if life were only like this]]!
-->-- ''Film/AnnieHall''

A character, in order to make a point, invokes thing/person/place/event [[LetXBeTheUnknown X]]. Another character then says something to the effect of "you know nothing about X" in rebuttal.

The implication is, of course, "''I'' know all about X in a way that is more accurate/intimate than you do, and it's nothing like what you're saying. Therefore, your argument is invalid."

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!!Examples:

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[[folder:Anime and Manga]]
* Played around with in ''MagicalGirlLyricalNanohaTheMovieFirst''. When Precia's {{Familiar}}, Lynith, learns about [[spoiler:[[{{Necromantic}} Alicia]]]] and confronts her master about it, Precia grabs Lynith and starts screaming that she doesn't know anything about [[spoiler:Alicia]] and how much she meant to Precia. Lynith immediately retorts that of course "I don't know anything. [[LaserGuidedAmnesia You were the one who made me forget]]".
[[/folder]]

[[folder:Film]]
* In Wolfgang Petersen's ''{{Troy}}'', Hector tells Paris that he know nothing about either death or love when the latter claims he is willing to kill or die for Helen, stating that he has killed and [[WarIsHell it is neither glorious nor beautiful]]. Justified as Paris ''is'' very naive at that point.
* As seen in the page quote above, ''Film/AnnieHall'' takes this to the ultimate, where [[Creator/WoodyAllen Alvy Singer]] pulls from nowhere Mr. [=McLuhan=] himself to point out that the man knows nothing about [=McLuhan=]'s work.
** This scene was parodied by ''Series/{{MADtv}}'' in their sketch "Crimes, Misdemeanors, and Payback", when one of the terrorists holding schoolgirls hostage pontificates to "Woody Allen" that he teaches a class at Columbia in International Terrorism and therefore knows about Yasser Arafat's works. Cue "Woody Allen" reaching behind a door and pulling out "Yasser Arafat" to tell the terrorist, "You know nothing of my work".
* PiratesOfTheCaribbean has this in the first movie: when Jack comments to his (former) crew that "the deepest circle of hell is reserved for traitors and mutineers", one crew member grabs him by the throat (and reveals his skeletal arm in the moonlight), hissing "you know nothing of hell."
[[/folder]]

[[folder:Literature]]
* MisplacedKindergartenTeacher Eliza Jane Wilder claims on her first day at [[Literature/LittleHouseOnThePrairie Laura Ingalls']] school that she intends to rule by love, not fear, and states that "birds in their little nests agree". Laura's thought is that she obviously knows nothing about birds. Ironically, Miss Wilder ends up as a SadistTeacher.
* In TheSecretGarden, when Martha lets it slip that she'd hoped Mary would be a native Indian, Mary flies into a rage and screams that "You know nothing about India. You know nothing about anything!"
* This is Ygritte's CatchPhrase in ''ASongOfIceAndFire''. Anytime Jon says something she thinks naive, she responds, "You know nothing, Jon Snow." It ranges from lighthearted and playful to frustrated and angry. Twice, Jon points out that the Wall is a giant block of ice and/or is incredibly cold. He's told this, both times, very seriously, implying he doesn't understand the magic at play.
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[[folder:Web Comics]]
* ''TheInexplicableAdventuresOfBob:'' Bob points out that Riboflavin's motivations for his crimes don't make sense. Riboflavin screams, "YOU DON'T KNOW ANYTHING, YOU LITTLE &%!!&!! AND THE PENALTY FOR IGNORANCE IS DEATH!!!" (indicating, of course, that Riboflavin knows Bob is right and refuses to admit it to himself).
[[/folder]]

[[folder:WesternAnimation]]
* In FamilyGuy, Peter once claims to be ''Poseidon: God of the Sea!'' The [[RefugeInAudacity real Poseidon]] walks up behind him and admonishes "No you're not, I am! And you know nothing of my work!"
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[[folder:Real Life]]
* In the 1988 U.S. vice presidential debates, Dan Quayle compared his experience to that of John F. Kennedy. His counterpart, Lloyd Bentsen, responded with the following:
-->'''Bentsen''': Senator, I served with Jack Kennedy, I knew Jack Kennedy, Jack Kennedy was a friend of mine. Senator, you're no Jack Kennedy.
[[/folder]]
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