A drunk 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'm looking for my car and I can't 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.