Marty McFly: Look, Doc, what's the worst that can happen, huh? So they don't name the ravine after her. Let's just get the DeLorean ready and get the hell out of here.
Doc: I wish I'd never invented that infernal time machine. It's caused nothing but disaster.

Jennifer Parker: Did you do that on purpose?
Marty McFly: Yeah. You think I'm stupid enough to race that asshole?

Doc: Marty, you have to wear the boots. You can't wear those futuristic things back in 1885. You shouldn't even be wearing them here in 1955.
Marty McFly: Look, Doc, as soon I get there I'll put them on. I promise.

Doc: Marty, you're not thinking fourth dimensionally!
Marty McFly: Yeah, I know, I got a real problem with that.

Doc: Reach!
Engineer: Is this a holdup?
Doc: It's a science experiment!

Jennifer Parker: Dr. Brown, I brought this note back from the future and now it's erased.
Doc: Of course it's erased.
Jennifer Parker: But what does that mean?
Doc: It means your future hasn't been written yet. No one's has. Your future is whatever you make it. So make it a good one, both of you.
Marty McFly: We will, Doc.

Clara was one in a million. One in a billion. One in a googolplex!

Doc

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Back to the Future Part III Quotes

Buford "Mad Dog" Tannen: You owe me money, blacksmith.
Doc: How do you figure?
Buford "Mad Dog" Tannen: My horse threw a shoe. And seeing as you was the one who done the shoeing, I say that makes you responsible.
Doc: Well, since you never paid me for that job, I say that makes us even!
Buford "Mad Dog" Tannen: Wrong! See I was ON my horse when it threw the shoe and I got throwed OFF! And THAT caused me to bust a perfectly good bottle of fine Kentucky red-eye. So, the way I figure it, blacksmith, you owe me five dollars for the whiskey and $75 for the horse.

This'll shoot the fleas off a dog's back at five hundred yards, Tannen, and it's pointed straight at your head!

Doc