Okay, I got one.
It's late Saturday night at the local bar. Just about everybody is drunk by the time the place closes. But, none as drunk as one particular fellow.
This man has had so much to drink, he is literally walking in circles. Bad thing is... He has to drive himself home in just a few minutes.
So, the bar closes, and with that, droves of drunken men swarm out of the bar, making for their vehicles.
This poor lad is so drunk, it takes him five full minutes to get from the door, to his car, to fumbling with the lock, to wrestling with the seat-belt, to finally starting the car.
He leaves with the rest of the pack, but quickly moves ahead of them. He did not realize it at the time, but he was going ten miles above the speed limit.
He catches himself though, and slows back down in time to avoid trouble. Well.. some trouble. He is still dancing from curb to curb all over the road.
It didn't take long before he saw the flashing lights behind him, accompanied by the familiar blare of police sirens.
Busted.
He stops the car, and the police officer steps up to the window and begins asking all of the standard questions.
Cop: Have you been drinking tonight, sir?
Man: Yehh...
Cop: How much?
Man: Oney a bahtll or too.
Cop: Uh-huh, step out of the car please.
Man: Kay.
The scene progressed as normal from there on, with the addition of one unusual detail: The pack of drunkards he had passed earlier had now caught up, and were passing the distracted cop almost effortlessly.
As soon as the last car had cleared the cop's field of vision, the man's behavior suddenly changed quite drastically.
Cop: Can you walk in a straight line for me.
Man: No problem, sir.
*Walks a perfectly straight line*
Cop: What the?...
Man: What the, what, sir?
Cop: Come here, breathe into this.
Man: Certainly.
Cop: *Views readings*
Cop: Zero??? What the hell? Who are you?
Man: *victory smirk*
Man: I'm the designated decoy.
--THE END--
That had to have been the longest build up to the punch line in the history of forever.