Amy: But what if we ask one of our friends to help us out? How about Leonard?
Sheldon: Gee, I don't know. Can we trust him?
Amy: He's your best friend in the whole world.
Sheldon: Yes, but he's always struck me as the guy in the plane crash who doesn't wait until you're all the way dead to eat you.
Amy: I think you can trust him.
Sheldon: Oh, Amy, you never lose that childlike innocence.