If you put your mind to it, you can accomplish anything.

Marty McFly

If my calculations are correct, when this baby hits eighty-eight miles per hour... you're gonna see some serious shit.

Dr. Emmett Brown

What if I send it in and they don't like it? What if they say I'm no good? What if they say "Get out of here, kid. You got no future." I mean, I just don't think I can take that kind of rejection. Jesus, I'm starting to sound like my old man!

Marty McFly

Like I've always told you, if you put your mind to it, you can accomplish ANYTHING.

George McFly

Mr. Strickland: I noticed your band is on the roster for the dance auditions after school today. Why even bother, McFly? You don't have a chance, you're too much like your old man. No McFly ever amounted to anything in the history of Hill Valley!
Marty McFly: Yeah, well, history is gonna change.

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?

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

Dr. Emmett Brown: Then tell me, "Future Boy," who's President in the United States in 1985?
Marty McFly: Ronald Reagan.
Dr. Emmett Brown: [laughs] Ronald Reagan. The actor? Then who's VICE-President? Jerry Lewis!

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

[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]

Younger Dr. Emmett Brown: [running out of the room] 1.21 gigawatts? 1.21 gigawatts? Great Scott!
Marty McFly: [following] What-what the hell is a gigawatt?