Best threat in movies / TV

From the newest Batman film (which I just saw today)

warning: contains a minor plot spoiler.

Let me get this straight: You think that your client, one of the wealthiest, most powerful men in the world, is secretly a vigilante who beats criminals to a pulp with his bare hands. And your plan is to blackmail this person? Good luck with that.

And of course, the worst ever threat
Slartibartfast: You must come with me.
Arthur Dent: Who are you?
Slartibartfast: What? No. My name’s not important. You must come with me, or you’ll be late.
Arthur Dent: Late for what?
Slartibartfast: Well, um, what’s your name Earthman?
Arthur Dent: Dent. Arthur Dent.
Slartibartfast: Well, late as in the late Dentarthurdent. It’s a sort of threat. You see?

“I’m gonna BARBECUE your ASS in MOLASSES!!!11!!11!”

—Sheriff Buford T. Justice (Jackie Gleason), in Smokey and the Bandit (1977)

“All right now, I’m coming out there! Any man I see, I am gonna kill him. Any son of a bitch takes a shot at me, not only am I gonna kill him, but I’m gonna kill his wife, and all his friends. And burn his fuckin house down.”

Clint Eastwood in Unforgiven

Will always be my favorite. Ever.

Commander Data to a time traveller who is trying to kidnap him. Completely even tone of voice:

“I assume your handprint will open this door whether you are conscious or not.”

Also, Richard Nixon as played by Anthony Hopkins:

"Presidents don’t threaten. They don’t have to. "