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: You're Mad Dog Tannen!
Buford "Mad Dog" Tannen: Mad Dog? I hate that name. I hate it. You hear? 'Cause nobody calls me "Mad Dog", especially not some duded-up, egg-sucking gutter trash.

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

Strickland's Deputy: Buford Tannen, you're under arrest for robbing the Pine City Stage! You got anything to say?
Buford "Mad Dog" Tannen: I hate manure.

Marty McFly: Great Scott!
Doc: I know, this is heavy.

We shall proceed as planned, and as soon as we return to 1985, we shall destroy this infernal machine. Traveling through time has become much too painful.

Doc

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.

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

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

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!

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

Doc

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.

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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.