If I were to write one of those "All I Really Need to Know I Learned in..." books it would be with Coen Brothers films. Here's a working list of some of the lessons I've learned through watching Coen Brothers films. Please, feel free to add more.
Walter Sobchak: I don't roll on Shabbos!
Bunny Lebowski: Uli doesn't care about anything. He's a Nihilist.
The Dude: Ah, that must be exhausting
The Big Lebowski: What makes a man, Mr. Lebowski? ...
The Big Lebowski: Is it being prepared to do the right thing, whatever the cost? Isn't that what makes a man?
The Dude: Hmmm... Sure, that and a pair of testicles
The Big Lebowski: Strong men also cry... strong men also cry.
Young boy: You men from tha bank?
Delmar: No, son, we're not from the bank.
Young boy: Any o' you men servin' papers? I'm suppose ta shoot anyone servin' papers!
Delmar: We're not sevin' no papers neither. Is your daddy home, son?
Young Boy: I nicked tha census man!
Delmar: Now there's a good boy!
Pappy O'Daniel: I'll press your flesh, you dimwitted sumbitch! You don't tell your pappy how to court the electorate. We ain't one-at-a-timin' here. We're MASS communicating!
Norville: You know, for kids.
Ulysses Everett McGill: No thank you, Delmar. One third of a gopher would only arouse my appetite without bedding it down.
The Stranger: Sometimes you eat the bar, and sometimes, well, he eats you.
Old man: Son, you got a panty on your head