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Doc: The justice system moves swiftly now that they've abolished all the lawyers.

Doc: Marty! What in the name of Sir Issac H. Newton happened here?

Doc: No! It can't be! I just sent you back to the future!
Marty: You did, oh, I know, you did send me back to the future, but I'm back...I'm back from the future.
Doc: Great Scott! (faints)

Marty: There he is, Doc! Let's land on him, we'll cripple his car.
Doc: Marty, he's in a '46 Ford, we're in a DeLorean. He'd rip through us like we were tin foil.

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

Biff: That's about as funny as a screen door on a battleship.
Marty: It's "screen door on a submarine," you dork.

Young Biff: 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.