"Either your signature or your brains are going to be on the contract."

Which Gilmore Girls character said that? In what episode? And what was he^* talking about?

^* I use the pronoun "he," because it's convenient. But this doesn't mean the character is a man.

Where does that line come from, anyway? Here's a hint: It's a movie, the first of a trilogy. And there are references to that trilogy in at least 5 other episodes of Gilmore Girls. Do you know what they are?