First, you turn the time circuits on. This one tells you where you're going. This one tells you where you are. This one tells you where you were. You input your destination time on this keypad. Say you want to see the signing of the Declaration of Independence [Jul. 4, 1776] or witness the birth of Christ [Dec. 25, 0000]. Here's a red-letter date in the history of science: November 5, 1955. Yes! Of course! November 5, 1955! That was the day I invented time-travel. I remember it vividly. I was standing on the edge of my toilet hanging a clock, the porcelain was wet, I slipped, hit my head on the sink, and when I came to I had a revelation! A vision! A picture in my head! A picture of this! This is what makes time travel possible: the flux capacitor! It's taken me nearly thirty years and my entire family fortune to realize the vision of that day. My God, has it been that long? Things have certainly changed around here. I remember when this was all farmland as far as the eye could see! Old man Peabody owned all of this! He had this crazy idea about breeding pine trees.

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

(1955 Biff) You got my homework finished, McFly?

You're not thinking fourth dimensionally!

(to Marty) Since you're new here, I'm gonna cut you a break... today. So why don't you make like a tree... and get outta here!

Biff: Hey, McFly! [both George and Marty turn around] What do you think your doing?
Marty: [to himself] Biff.
Biff: Hey, I'm talking to you McFly, you Irish bug!
George: Oh, hey, Biff. Hey, guys. How are you doin'?
Biff: Do you got my homework finished, McFly?
George: Well, I figured since it wasn't due till Monday -
Biff: Hello? Hello? Anybody home, huh, Think, McFly! Think! I gotta have time to recopy it. Do you realize what what would happen if I handed in my homework in your handwriting? I'll get kicked out of school. You wouldn't want that to happen would ya? WOULD YA?!
George: Of course not, Biff. Now I wouldn't want that to happen.
Biff: [notices Marty staring at him] Well, what are you looking at, butthead!

Lorraine: Do you have a television set?
Marty: Well, yeah, you know we have two of them.
Milton Baines: Wow! You must be rich.
Stella Baines: Oh, honey, he's teasing you. Nobody has two television sets.
Marty: Hey! Hey, I've seen this one! This is a classic. This is where Ralph dresses up as a man from space.
Milton Baines: What do you mean you've seen this? It's brand new.
Marty: Yeah, but I saw it on a... re-run.
Milton Baines: What's a re-run?
Marty McFly: You'll find out.

George: Last night, Darth Vader came down from planet Vulcan and told me that if I didn't ask Lorraine out that he'd melt my brain.
Marty: Okay George, let's just keep this brain melting stuff to ourselves, okay?
George: Oh yeah, right.

(1985 Biff) My insurance? It's your car! Your insurance should pay for it, hey I wanna know who's going to pay for this? I spilled beer all over when that car smashed into me, who's going pay my cleaning bill? And where's my reports?

(1985 Biff) Well, what are you looking at, butthead? Say "hi" to your mom for me.

(after reading the flyer) 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 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!

Please excuse the crudity of this model as I didn't have time to build it to scale or paint it.

Doc Brown: Ha! What did I tell you?! 88 miles per hour! The temporal displacement occurred exactly 1:20 AM and zero seconds!
Marty McFly: Jesus Christ, Doc! You disintegrated Einstein!
Doc Brown: Calm down Marty. I didn't disintegrate anything. The molecular structure of both Einstein and the car are completely intact!
Marty: Then where the hell are they?
Doc 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, 1:21 A.M. and zero seconds, we shall catch up with him and the time machine!
Marty: Wait a minute, wait a minute Doc, uh, are you telling me you built a time machine... out of a DeLorean?!
Doc Brown: The way I see it, if you're going to build a time machine into a car, why not do it with some style? Besides, the stainless steel construction made the flux dispersal...(watch beeps) Look out! (time machine comes back)

George: [to Lorraine] I'm your density. [Pauses, checks note]...destiny.