[Dr. Emmett Brown is doubting Marty McFly's story about that he is from the future]
Dr. Emmett Brown: Then tell me, "Future Boy", who's President in the United States in 1985?
Marty McFly: Ronald Reagan.
Dr. Emmett Brown: Ronald Reagan? The actor?
[chuckles in disbelief]
Dr. Emmett Brown: Then who's VICE-President? Jerry Lewis?
[rushing out and down a hill toward his laboratory]
Dr. Emmett Brown: I suppose Jane Wyman is the First Lady!
Marty McFly: [following Doc] Whoa! Wait! Doc!
Dr. Emmett Brown: And Jack Benny is Secretary of the Treasury.
Marty McFly: [outside the lab door] Doc, you gotta listen to me.
Dr. Emmett Brown: [opens the door to the lab] I've had enough practical jokes for one evening. Good night, Future Boy!
[closes the door leaving Marty outside]
Marty McFly: No, wait! Doc. 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...
Marty McFly: Which... is what makes time travel possible.
[Doc opens the door and looks at Marty with a stunned look on his face]

Stella Baines: He's a very strange young man.
Sam Baines: He's an idiot. Comes from upbringing. Parents are probably idiots too. Lorraine, if you ever have a kid that acts that way I'll disown you.

Marty McFly: Lorraine, What are you doin'?
Lorraine Baines: 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 McFly Geez! You smoke too?
Lorraine Baines: Marty, you're beginning to sound just like my mother!

I have your car towed all the way to your house and all you've got for me is *lite* beer?

Biff Tannen

Marty McFly: Doc, you don't just walk into a store and buy plutonium. Did you rip that off?
Dr. Emmett Brown: Shhhhhh. Of course. From a group of Libyan nationalists. They wanted me to build them a bomb, so I took their plutonium and in turn, gave them a shoddy bomb-casing full of used pinball machine parts! Come on! Let's get you a radiation suit. We must prepare to reload.

Last night, Darth Vader came down from planet Vulcan and told me that if I didn't take Lorraine out that he'd melt my brain.

George McFly

Lorraine Baines: Kids, we're gonna have to eat this cake by ourselves. Your Uncle Joey didn't make parole again.
[drops the cake on the dining table. It reads "Welcome Home, Uncle Joey"]
Lorraine Baines: Think it would be nice if you all dropped him a line.
Marty McFly: Uncle "Jailbird" Joey?
Dave McFly: He's *your brother*, Mom.
Linda McFly: Yeah. I think it's a major embarrassment having an uncle in prison.
Lorraine Baines: We all make mistakes in life, children.

Marty McFly: Wait a minute, Doc, are you trying to tell me that my mother has got the hots for me?
Dr. Emmett Brown: Precisely.
Marty McFly: Whoa, this is heavy.
Dr. Emmett Brown: There's that word again; "heavy". Why are things so heavy in the future? Is there a problem with the earth's gravitational pull?

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

Dr. Emmett Brown

[kissing George on the head] See ya later, Pop. Wooo, time to change that oil.

Dave McFly

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

Marty McFly

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

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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.