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?

Buford's Gang Member #2: Hey, get a gander at them moccasins! What kinda skins is them? What's that writing mean?
Buford's Gang Member #1: "Nee-kay"? What is that, some kinda Injun talk or something?

Marty McFly: I'm sorry, Doc. It's all my fault you're stuck back there. I never should have let Biff get to me!
Young Doc: Well, there are plenty worse places to be than the Old West. I could've ended up in the Dark Ages. They probably would have burned me at the stake as a heretic or something.

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

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

Buford "Mad Dog" Tannen: What's your name, dude?
Marty McFly: Uh, Mar-, uh... Eastwood. Clint Eastwood.
Buford "Mad Dog" Tannen: What kind of stupid name is that?

Buford "Mad Dog" Tannen: Marshall Strickland. I didn't know you was back in town.
Marshall Strickland: If you can't read the sign, Tannen, I presume you can read THIS.

"Shot in the back by Buford Tannen, over a matter of 80 dollars." What kind of future do you call that?

Young Doc

Buford "Mad Dog" Tannen: Wake up! Let's go! I got me a runt to kill!
Buford's Gang Member #1: It's still early, boss. What's your hurry?
Buford "Mad Dog" Tannen: I'm hungry.

Marty McFly: Listen! I'm not really feeling up to this today, so I'm gonna have to forfeit!
Buford "Mad Dog" Tannen: Forfeit? Forfeit? What's that mean?
Buford's Gang Member #1: Uh, it means that you win without a fight.
Buford "Mad Dog" Tannen: Without shooting? He can't do that.

Buford "Mad Dog" Tannen: I think you're nothing but a gutless yellow turd! And I'm giving you to the count of ten to come out here, and prove I'm wrong! One...
Marty McFly: Doc... Sober up, buddy. Let's get sober.
Buford "Mad Dog" Tannen: Two...
Saloon Old Timer #3: You gotta get out there, son. I got $20 gold bet on you, so don't let me down.
Buford "Mad Dog" Tannen: Three...
Saloon Old-Timer #2: I got $30 gold bet again' you, so don't let me down.
Buford "Mad Dog" Tannen: Four...

Marty, you can't go losing your judgment every time someone calls you a name. It's exactly what causes you to get into that accident in the future.

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