[talking about the Time Machine]
Marty McFly: [looks through a camcorder] This is uh... This is heavy duty, Doc. This is great. Uh, does it run, like, on regular unleaded gasoline?
Dr. Emmett Brown: Unfortunately no, it requires something with a little more kick - plutonium.
Marty McFly: Uh, plutonium? Wait a minute. Are-
[lowers the camcorder]
Marty McFly: Are you telling me that this sucker is nuclear?
Dr. Emmett Brown: Hey, hey, hey. Keep rolling. Keep rolling, there.
[Marty raises the camcorder]
Dr. Emmett Brown: No, no, no, no, no. This sucker's electrical. But I need a nuclear reaction to generate the 1.21 gigawatts of electricity I need.
Marty McFly: Doc, you don't just walk into a store and-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 shiny bomb-casing full of used pinball machine parts! Come on! Let's get you a radiation suit. We must prepare to reload.

This is heavy.

Marty McFly

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?

Biff Tannen

[Marty has crashed into a theater after getting back to 1985] Crazy drunk driver.

Red the Bum

Dr. Emmett Brown: [reads the "Save the Clock Tower" flyer and reacts with hope] This is it! This is the answer. It says here... that a bolt of lightning is going to strike the clock tower at precisely 10:04pm, next Saturday night! If... If we could somehow... *harness* this lightning... *channel* it... into the flux capacitor... it just might work. Next Saturday night, we're sending you back to the future!

I'm sure that in 1985 plutonium is available in every corner drugstore, but in 1955 it's a little hard to come by.

Dr. Emmett Brown

[on the phone, as Marty plays "Johnny B. Goode"] Chuck. Chuck. It's Marvin - your cousin, Marvin BERRY. You know that new sound you're looking for? Well, listen to this.
[holds the receiver out]

Marvin Berry

Marty McFly: [watching a Honeymooners episode in 1955] Hey, hey, I've seen this one. I've seen this one. This is a classic. This is, uh, where Ralph dresses up as a man from space.
Milton Baines: What do you mean, you've seen this? It's brand new.
Marty McFly: Yeah, well, I saw it on a
Marty McFly: ... rerun.
Milton Baines: What's a rerun?
Marty McFly: You'll find out.

[Stella Baines is Marty's future grandmother]
Stella Baines: Marty, you look so familiar to me. Do I know your mother?
Marty McFly: [turning to look at Lorraine, his mother in the future] Yeah, I think maybe you do...

[Marty sees the outside of the Hill Valley High School in 1955]
Marty McFly: Whoa... they really cleaned this place up. Looks brand-new.
[Marty and Doc walk toward the building]
Dr. Emmett Brown: Now, remember - according to my theory, you interfered with your parents first meeting. If they don't meet, they won't fall in love, they won't get married and they won't have kids. That's why your older brother's disappearing from that photograph. Your sister will follow, and unless you repair the damage, you'll be next.
Marty McFly: Sounds pretty heavy.
Dr. Emmett Brown: Weight has nothing to do with it.

[on the phone while all the clocks chime at once]
Dr. Emmett Brown: Are those my clocks I hear?
Marty McFly: Yeah! Uh, it's 8 o'clock!
Dr. Emmett Brown: Perfect! My experiment worked! They're all exactly 25 minutes slow.
Marty McFly: Wait a minute. Wait a minute. Doc... Are you telling me that it's 8:25?
Dr. Emmett Brown: Precisely.
Marty McFly: Damn! I'm late for school!
[hangs up, grabs his skateboard and rushes out]

Marty 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, uh, that's John F. Kennedy Drive.
Sam Baines: Who the hell is John F. Kennedy?

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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.