Dr. Emmett Brown: This is it! This is the answer. It says here... that a bolt of lightning is going to strike the clock tower at precisely 10:04 pm, next Saturday night! If we can 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 in 1985 plutonium is available at every corner drugstore, but in 1955, it's a little hard to come by.

Dr. Emmett Brown

George McFly: I know what you're gonna say, son. And you're right, you're right. But uh... Biff just happens to be my supervisor, and I'm afraid I'm just no good at... confrontations.
Marty McFly: The car, Dad. I mean he wrecked it. He totaled it. I needed that car tomorrow night, Dad. Do you have any idea how important this is to me? Do you have any clue?
George McFly: I know, And all I can say is... I'm sorry.

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Back to the Future Quotes

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?

[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]