Dr. Emmett Brown: 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 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!
Dr. Emmett Brown: No wonder your president has to be an actor, he's gotta look good on television.
Sam Baines: Stella! Another one of these damn kids jumped in front of my car! Come on out here and help me take him in the house!
Marvin Berry: Chuck. Chuck! It's Marvin - your cousin, Marvin BERRY. You know that new sound you're looking for? Well, listen to this!
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.
Biff Tannen: Why don't you make like a tree and get out of here!
Marty McFly: Silence, earthling! My name is Darth Vader. I'm an extra-terrestrial from the planet Vulcan!
[Lorraine's parents are talking about Marty McFly, Lorraine's future son.]
Stella Baines: He's a very strange young man.
Sam Baines: He's an idiot. Comes from upbringing. His parents are probably idiots too. Lorraine, if you ever have a kid that acts that way I'll disown you.
Marty McFly: Jesus, George, it was a wonder I was even born.
Doc: Next Saturday night, we're sending you Back to the Future!
Biff: Why don't you make like a tree, and get out of here?