The other night a cop was parked outside a local neighborhood tavern. Late in the evening, the officer noticed a man leaving the bar so intoxicated that he could barely walk. The man stumbled around the parking lot for a few minutes with the officer quietly observing. After what seemed an eternity and trying his keys on five vehicles, the man managed to find his car, which he promptly fell into. He was there for a few minutes as a number of other patrons left the bar and drove off. Finally he started the car, switched the wipers on and off, flicked the turn signals on and off, tooted the horn and then switched on the lights. He moved the vehicle forward a few inches, reversed a little and then remained stationary for a few more minutes as some more vehicles left. At last he pulled out of the parking lot and started to drive slowly down the road. The police officer, having bemusedly waited all this time, now started up the patrol car, flipped on the siren, and promptly pulled the man over and carried out a Breathalyzer test. To his amazement, the Breathalyzer indicated no evidence of the man having consumed alcohol at all. Dumbfounded, the officer said, "I'll need you to accompany me to the station. This Breathalyzer equipment must be broken." "I doubt it," said the man. "Tonight I'm the designated decoy."