Biff: Oh! Nice dress, Lorraine. Although, I think you'd look better wearing nothing at all.

Lorraine: Biff, why don't you take a long walk off a short pier?

Biff: Hey listen, Lorraine. Now that I got my car all fixed up I figured I cut you a break and give you the honor of going with the best looking guy in school.

Lorraine: Yeah, well, I'm busy.

Biff: Oh, yeah? Doing what?

Lorraine: Washing my hair.

Biff: Oh, that's about as funny as a screen door on a battleship.

Marty: Screen door on a submarine, you dork.

Doc: The time-traveling is just too dangerous. Better that I devote myself to study the other great mystery of the universe...women!

Young Biff: Manure! I HATE manure!

Old Biff: I have a little something for you. You do want to be rich, don't you?

Young Biff: Oh, yeah. Sure. That's rich. You're gonna make me rich.

Old Biff: You see this book? This book tells the future. It tells the outcome of every major sports event 'til the end of the century. Football, baseball, horse races, boxing. The information in here is worth millions, and I'm giving it to you.

Young Biff: That's very nice. Thank you very much. Now why don't you make like a tree, and get out of here?

Old Biff: It's LEAVE, you idiot! "Make like a tree and leave." You sound like a damn fool when you say it wrong!

Marty: Nobody calls me chicken.

Marty: You're not going to believe this. We have to go back to 1955.

Doc: I don't believe it!

Marty: That's right, Doc. November 12, 1955.

Doc: Unbelievable, that old Biff could have chosen that particular date. It could mean that that point in time inherently contains some sort of cosmic significance. Almost as if it were the junction point for the entire space-time continuum. On the other hand, it could just be an amazing coincidence.