Marty McFly: Wait a minute, Doc. Ah... Are you telling me you built a time machine... out of a DeLorean?
Dr. Emmett Brown: The way I see it, if you're gonna build a time machine into a car, why not do it with some style?

No, wait! Doc. The... the... the bruise! The bruise on your head. I know how that happened! You told me the whole story. You were standing on your toilet, and you were hanging a clock, and you fell, and you hit your head on the sink. And that's when you came up with the idea for the Flux Capacitor... which... is what... makes time travel possible.

Marty McFly

Dr. Emmett Brown: I suppose Jane Wyman is the First Lady!
Marty McFly: Whoa! Wait! Doc!
Dr. Emmett Brown: And Jack Benny, the Secretary of the Treasury.
Marty McFly: Doc, You gotta listen to me.
Dr. Emmett Brown: I've had enough practical jokes for one evening. Good night, Future Boy!

Mr. McFly! Mr. McFly, this just arrived. Oh, hi, Marty. I think it's your new book.

Biff Tannen

[introducing his band] All right. We're the, uh... we're the Pinheads.

Marty McFly

Marty McFly: You know, Doc, you left your equipment on all week.
Dr. Emmett Brown: My equipment. That reminds me, Marty. You better not hook up to the amplifier. There's a slight possibility of overload.
Marty McFly: Yeah, I'll keep that in mind.

Dr. Emmett Brown: Oh, my God, they found me, I don't know how, but they found me. Run for it Marty!
Marty McFly: Who? Who?
Dr. Emmett Brown: Who do you think? The Libyans.
Marty McFly: Holy shit!

Marty McFly: Ah, Jesus Christ! Jesus Christ, Doc, you just disintegrated Einstein!
Dr. Emmett Brown: Calm down, Marty, I didn't disintegrate anything. The molecular structure of both Einstein and the car are completely intact.
Marty McFly: Then where the hell are they?
Dr. Emmett Brown: The appropriate question is, "WHEN is the hell are they?" You see, Einstein has just become the world's first time-traveler! I sent him into the future. One minute into the future to be exact. And at precisely 1:21 am and zero seconds, we shall catch up with him and the time machine.

arty McFly: Do you know where Riverside Drive is?
Sam Baines: It's on the other end of town, a block past Maple. East end of town.
Marty McFly: A block past Maple? That's John F. Kennedy Drive.
Sam Baines: Who the hell is John F. Kennedy?

Wait, you don't understand. If you don't play there's no music. If there's no music they don't dance. If they don't dance they don't kiss and fall in love and I'm history.

Marty McFly

[chased by terrorists] Let's see if you bastards can do 90.

Marty McFly

Jesus, George, it's a wonder I was ever born.

Marty McFly

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Back to the Future Quotes

[Marty places headphones over his father's ears and wakes him up by playing Van Halen music at full blast. George wakes up screaming - Marty pauses the music. George looks up to see Marty, who is unrecognizable because he is wearing a radiation suit]
George McFly: Who are you?
Marty McFly: [after giving him another earful of loud rock music] Silence Earthling! My name is Darth Vader. I am an extraterrestrial from the planet Vulcan!
[makes Live Long and Prosper sign with his hand]

[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.