Big Bang Theory Quote
(Penny is trying to convince Sheldon to buy Leonard a gift)
Howard: Try telling him it's a non-optional social convention.
Penny: What?
Howard: Just do it.
Penny: It's - it's a non-optional social convention.
Sheldon: Ah, fair enough.
Howard: He came with a manual.
Quote from S01E16 - The Peanut Reaction