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

Marty McFly: Listen, you got a back door to this place?
Bartender: Yeah, it's in the back.

Marty McFly: Hey, look, Frisbee. Far-out! [leaves]
Seamus McFly: Wonder what he meant by that?
Maggie McFly: It was right in front of him.