A routine police patrol parked outside a bar on a stake out, the officer noticed a man leaving the bar so intoxicated that he could barely walk. The man stumbled around the car park for a few minutes, with the officer quietly observing. After what seemed an eternity and trying his keys in five different vehicles, the man managed to find his car which he fell into. He sat 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 (it was a fine, dry summer night), flicked the indicators on, then off a couple of times, honked the horn and then switched on the lights. He moved the vehicle forward a few inches, reversed a little and then remained still for a few more minutes as some more of the other patron vehicles left. At last, with the carpark empty, he pulled out started to drive slowly down the road. The police officer, having patiently waited all this time, now started up the patrol car, put on the flashing lights, 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 any alcohol at all! Dumbfounded, the officer said, "I'll have to ask you to accompany me to the police station. This breathalyzer equipment must be broken." "I doubt it," said the truly proud man. "Tonight I'm the designated decoy."