Marty McFly: Calvin? Wh... Why do you keep calling me Calvin?
Lorraine Baines: Well, that is your name, isn't it? Calvin Klein? It's written all over your underwear.

Young Doc: No! It can't be; I just sent you back to the future!
Marty McFly: No, I know; you *did* send me back to the future. But I'm back - I'm back *from* the future.
Young Doc: Great Scott!
[Doc faints]
Marty McFly: Doc! Doc! Doc! Ohhhh...

Marty McFly: Hey, Doc! Where you going now? Back to the future?
Doc: Nope. Already been there.