The Wit of the Marx Brothers
Groucho's attempts at romance (from Horse Feathers):
    Connie (Thelma Todd): Oh Professor, you're so full of whimsy.
    Wagstaff (Groucho): Can you notice it from there? I'm always that way after I eat radishes.
Groucho just being Groucho (from Horse Feathers):
    Why don't you go home to your wife? I'll tell you what I'll go home to your wife, and outside of the improvement she'll never know the difference.
Groucho and Chico on Contracts (from A Night at the Opera):
    Forelo (Chico): Hey, wait - wait! What does this say here? This thing here?
    Driftwood (Groucho): Oh, that? Oh, that's the usual clause. That's in every contract. That just says - uh - it says - uh - if any of the parties participating in this contract is shown not to be in their right mind, the entire agreement is automatically nullified.
    Forelo: Well, I don't know.
    Driftwood: It's all right. That's - that's in every contract. That's - that's what they call a sanity clause.
    Forelo: Ha ha ha. You can't fool me. There ain't no Sanity Clause!