Marty, we all have to make decisions that affect the course of our lives. You've got to do what you've got to do. And I've got to do what I've got to do.

Doc

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.

Bartender: In about ten minutes, he's gonna be as sober as a priest on Sunday.
Marty McFly: Ten minutes? Why do we have to cut these things so damn close?

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

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

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.

Young Doc: No wonder this circuit failed. It says "Made in Japan".
Marty McFly: What do you mean, Doc? All the best stuff is made in Japan.
Young Doc: Unbelievable.

Marty McFly: Clayton Ravine was named after a teacher. They say she fell in there a hundred years ago.
Doc: A hundred years ago? That's this year!
Marty McFly: Every kid in school knows that story 'cause we all have teachers we'd like to see fall into the ravine.

Marty McFly: Hey, Doc! Where you going now? Back to the future?
Doc: Nope. Already been there.

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

Doc: Marty, I gave you explicit instructions not to come here but to go directly back to 1985.
Marty McFly: I know, Doc.
Doc: But it's good to see you, Marty.

Buford "Mad Dog" Tannen: Then let's settle it, right now!
Buford's Gang Member #1: Uh, not now, Buford. Marshal's got our guns.
Buford "Mad Dog" Tannen: Like I said, we'll finish this tomorrow.
Buford's Gang Member #2: Tomorrow, we're robbing the Pine City Stage.
Buford "Mad Dog" Tannen: What about Monday? Are we doing anything Monday?
Buford's Gang Member #1: Uh, no, Monday would be fine. You can kill him on Monday.
Buford "Mad Dog" Tannen: I'll be back this way on Monday! We'll settle this then... right there... out in the street... in front of the Palace Saloon!
Marty McFly: Yeah, like when? High noon?
Buford "Mad Dog" Tannen: Noon? I do my killin' before breakfast! Seven o'clock!
Marty McFly: Eight o'clock. I do my killing after breakfast!

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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.