Marty McFly: 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.

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! [faints]
Marty McFly: Doc! Doc! Doc!

Biff Tannen, I wouldn't marry you if you had a million dollars.

Lorraine Baines

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.
Young Biff: All right then, leave! And take your book with you!

[watching chase unfold in 2015] There's something very familiar about all this.

Old Biff

Marty McFly: 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.

S. S. Strickland: So you're the son of a bitch who's been stealing my newspapers.
Marty McFly: Mr. Strickland! It- it- it's me, sir. Marty McFly!

S. S. Strickland: Who?
[jabs Marty with shotgun threateningly]
Marty McFly: Marty McFly! Marty McFly! Don't you know, Mr... From school, sir!
S. S. Strickland: I've never seen you before, but you look to me like a slacker!
Marty McFly: Yeah! That's right! That's right, I am a slacker! Don't you remember, you gave me detention last week!
S. S. Strickland: Last week? The school burnt down six years ago! Now you got exactly three seconds to get off my porch with your nuts intact!

Lorraine Baines: Are you all right?
Marty McFly: I'm fine, I'm fine. It's just that you're so... big...

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Back to the Future Part II Quotes

Biff Tannen: That's about as funny as a screen door on a battleship.
Marty McFly: [under his breath] It's screen door on a submarine, you dork.

Marty McFly: The answer's no, Griff.
Griff Tannen: No?
Marty McFly: Yeah, what are you deaf and stupid? I said "NO!"
Griff Tannen: What's wrong, McFly. 'You chicken?