[on the phone]
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!

Dr. Emmett Brown: [the DeLorean has just made the first time-jump] Ah! What did I tell you? 88 miles per hour! The temporal displacement occurred exactly 1:20am and zero seconds!
Marty McFly: Ah, Jesus Christ! Jesus Christ, Doc, you 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* 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 1:21am and zero seconds, we shall catch up with him and the time machine.

Great Scott!

Dr. Emmett Brown

[Marty and Doc observe George's incompetence in 1955]
Dr. Emmett Brown: Which one's your pop?
Marty McFly: [points him out] That's him.
[they see him getting kicked around by other school bullies]
George McFly: [has a 'kick me' sign on his back] Okay. Okay you guys. Ah-ha-ha-ha, very funny. You guys are being real mature.
Dr. Emmett Brown: Maybe you were adopted.

Marty McFly: [acting cool] Do you mind if we... park... for a while?
Lorraine Baines: That's a great idea. I'd love to park.
Marty McFly: Huh?
Lorraine Baines: Marty, I'm almost 18 years old. It's not like I've never parked before.
Marty McFly: What?
Lorraine Baines: Marty, you seem so nervous. Is something wrong?
Marty McFly: [trying to maintain composure] No... No.
[Lorraine takes a sip from a liquor bottle]
Marty McFly: [grabbing the bottle from Lorraine] Lorraine, Lorraine, What are you doin'?
Lorraine Baines: [starting to laugh] I swiped it from the old lady's liquor cabinet.
Marty McFly: Yeah, well, you shouldn't drink.
Lorraine Baines: Why not?
Marty McFly: Because you - you might regret it later in life.
Lorraine Baines: Marty, don't be such a square. Everybody who's anybody drinks.
[Marty takes a sip from Lorraine's bottle then spit-takes as he notices Lorraine lighting a cigarette]
Marty McFly: [nauseatingly] Geez! You smoke too?
Lorraine Baines: Marty, you're beginning to sound just like my mother!

Dr. Emmett Brown: Marty, I'm sorry. But the only power source capable of generating 1.21 gigawatts of electricity is a bolt of lightning.
Marty McFly: [startled] What did you say?
Dr. Emmett Brown: A bolt of lighting. Unfortunately, you never know when or where it's ever gonna strike.
Marty McFly: We do now.
[hands Doc the "Save the Clock Tower" flyer]

[thinking Marty is an alien]
Sherman Peabody: It's already mutated into human form. Shoot it!
Old Man Peabody: [firing shotgun at barn] Take that, you mutated son of a bitch!

Things have certainly changed around *here*. I remember when this was all farmland as far the eye could see. Old man Peabody owned all of this. He had this crazy idea about breeding pine trees.

Dr. Emmett Brown

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.

[seeing a poster for the Enchantment Under the Sea dance]
Dr. Emmett Brown: Look. There's a rhythmic ceremonial ritual coming up.
Marty McFly: Of course! The Enchantment Under the Sea dance! They're supposed to go to this. That's where they kiss for the first time.
Dr. Emmett Brown: All right, kid. You stick to your father like glue and make sure he takes her to that dance.

[Marty wakes up in Lorraine's bed]
Marty McFly: Mom... is that you?
Lorraine Baines: There, there now. Just relax.
[pats a damp cloth on Marty's forehead]
Lorraine Baines: You've been asleep for almost nine hours now.
Marty McFly: I had a horrible nightmare. I dreamed that I went... back in time. It was terrible.
Lorraine Baines: Well... You're safe and sound now, back in good old 1955.
Marty McFly: [opens his eyes wide] 1955?

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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.