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?

Western Union Man: Kid, you all right? You need any help?
Marty McFly: There's only one man who can help me.

Marty McFly: Are you two related?
Biff Tannen: Hello? Hello? Anybody home? What do you think? Griff just called me Grandpa for his health?

Doc: Time circuits on.
Marty McFly: Time circuits on? What do you mean "Time Curcuits on"? Doc, we're not going back now!
Doc: Yep.
Marty McFly: Doc, What about Jennifer? What about Einstein? We can't just leave them here.
Doc: Don't worry, Marty. Assuming we succeed in our mission, this alternate 1985 will be changed back into the real 1985, instantaneously transforming around Jennifer and Einie. Jennifer and Einie will be fine, and they'll have absolutely no memory of this horrible place.
Marty McFly: Doc... what if we don't succeed?
Doc: We must succeed.

Young Doc: Nice talking to you. Maybe we can bump into each other sometime again in the future.
Older Doc: Or in the past.

Doc: Sometime today, old Biff will show up to give young Biff the Almanac. Above all, you must not interfere with that event. We must let Old Biff believe he succeeded, so that he'll leave 1955 and bring the DeLorean back to the future.
Marty McFly: Right.
Doc: Once Old Biff is gone, grab the Almanac anyway that you can. Remember, both of our futures depend on this.
Marty McFly: You don't have to remind me of that, Doc.

Marty McFly, Jr.: Hey, Gram, could you just stuff the whole thing in my mouth?
Middle-Aged Marty: Don't you be a smart-ass!

Biff Tannen: You're supposed to be in Switzerland, you little son of a bitch!
Marty McFly: My father?
Biff Tannen: Did you get kicked out of another boarding school? Damn it, Lorraine, do you know how much perfectly good dough I blow on this no-good kid of yours, huh? On all three of them!
Lorraine Baines: What the hell do you care? We can afford it! The least we can do with all that money is provide a better life for our children!

Grandma Tannen: Biff, Biff, where you going, Biff?
Biff Tannen: I told you, grandma, I'm goin' to the dance.
Grandma Tannen: When are you coming home?
Biff Tannen: I'll get home, when I get home.
Grandma Tannen: Don't forget to turn off the garage lights!

Biff Tannen: Hold on. Let's get this straight. Marty is YOUR kid, not mine. And all the money in the world wouldn't do jack shit for that lazy bum!
Lorraine Baines: Stop it, Biff, just stop it!
Biff Tannen: Look at him. He's a butthead just like his old man was.
Lorraine Baines: Don't you dare speak that way about George! You're not even half the man he was.

Lorraine Baines: Biff, somebody already asked me to the dance.
Biff Tannen: Who? That bug George McFly?
Lorraine Baines: I'm going with Calvin Klein, okay?
Biff Tannen: Calvin Klein? No, it's not okay!

Young Jennifer: I'm old!
Old Jennifer: I'm young!

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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?