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

Doc

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.

Doc: Look! If your horse threw a shoe, bring him back and I'll reshoe him!
Buford "Mad Dog" Tannen: I done SHOT that horse!
Doc: Well, that's your problem, Tannen!
Buford "Mad Dog" Tannen: Wrong! That's YOURS. So, from now on, you better be lookin' behind you when you walk. 'Cause one day you're gonna get a bullet in your back.

Marty McFly: Maybe it was a mistake, Doc. Maybe that grave wasn't yours. There could've been another Emmett Brown back in 1885.
Young Doc: No.
Marty McFly: Didn't you have any relatives here back then?
Young Doc: The Browns didn't come to Hill Valley until 1908, and then they were the Von Brauns. My father changed our name during the First World War.

Buford "Mad Dog" Tannen: Smile, Sheriff. After all, this is a party!
Marshall Strickland: The only party I'll be smilin' at is the one that sees you at the end of a rope.
Strickland's Deputy: Have fun.
Marshall Strickland: [turns to his son] See, that's how you handle them, son. Never give 'em an inch, and maintain discipline at all times. Remember that word - "discipline."
Marshal Strickland's son: I will, Pa.

So you're my great-grandfather. The first McFly born in America. And you peed on me.

Marty McFly

Marty McFly: How many did he have?
Bartender: Just one.
Marty McFly: Just the one?
Bartender: There's a fella who can't hold his liquor.

Doc: Marty, you're going to have to do something about those clothes. You walk around town dressed like that, you're liable to get shot.
Marty McFly: Or hanged.
Doc: What idiot dressed you in that outfit?
Marty McFly: You did.

Doc: And in the future, we don't need horses. We have motorized carriages called automobiles.
Saloon Old Timer #3: If everybody's got one of these auto-whatsits, does anybody walk or run anymore?
Doc: Of course we run. But for recreation. For fun.
Saloon Old Timer #3: Run for fun? What the hell kind of fun is that?

Listen up, Eastwood! I intend to shoot somebody today and I'd prefer it to be you. But if you're just too damn yellow, I guess it'll just have to be a blacksmith.

Buford "Mad Dog" Tannen

Bartender: Emmett! What can I get you? The usual?
Doc: No, Chester, I'm gonna need something a lot stronger than that tonight.
Bartender: Sarsaparilla?
Doc: Whiskey, Chester.

Marty McFly: I had this horrible nightmare. Dreamed I w-... dreamed I was in a western. And I was being chased by all these Indians... and a bear.
Maggie McFly: Well... you're safe and sound here, now, at the McFly farm.
Marty McFly: McFly farm? Why, you're my, my, my... who are you?

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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.