[Biff is waxing George's car, it's a silver BMW]
George McFly: Uh... now Biff, I want make sure that we get two coats of wax this time. Not just one.
Biff Tannen: Just finishing up the second coat now.
George McFly: Now Biff, don't con me!
Biff Tannen: I-I'm-I'm sorry, Mr. McFly. I-I meant I was just starting on the second coat.
George McFly: Ahh... Biff. What a character. Always trying to get away with something. I've had to stay on top of Biff ever since High School. Although if it wasn't for him...
Lorraine Baines: We never would have fallen in love.
George McFly: That's right.

Biff Tannen: What are you looking at butthead?
Skinhead: Hey Biff, get a load of this guy's life preserver. Dork thinks he's gonna drown.

Since you're new here, I-I'm gonna cut you a break... today. So, why don't you make like a tree and get outta here?

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!

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.

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: 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!

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

Old Biff: Hello? Hello? Anybody home? Huh? Think, McFly! Think! Your old man, Mr. Loser?
Marty McFly: What?
Old Biff: That's right. Loser with a capital "L".
Marty McFly: Look, I happen to know that George McFly is not a loser...
Old Biff: [interrupts] I'm not talkin' about George McFly. I'm talkin' about his kid! Your old man, Marty McFly Sr.? The man who took his life and flushed it completely down the toilet.
Marty McFly: I did? I- I mean he did?

Old Biff: Tough break, kid. Must be rough bein' named after a complete butthead.
Marty McFly: What's that supposed to mean?

Hey kid, say hi to your grandma for me.

Biff Tannen: Go ahead, kid! Jump! A suicide will be nice and neat.
Marty McFly: What if I don't?
Biff Tannen: Lead poisoning.

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