Der betrunkene Polizeiwagen

A drunken man is wandering around the parking lot of a bar, bumping into cars and feeling the roofs. The bouncer comes up to him.

“What the heck are you doing?!”, he asks.”I am looking for my car and I cannot find it!”, the drunk replies. “So how does feeling the roofs of these cars help?!”, the bouncer asks.

“Well, my car has two blue lights, and a siren on the roof!”, the drunk replies.