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 vehicles, the man managed to find his car, which he 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 (it was a fine dry night), flicked his indicators on, then off, tooted the horn and then switched on the lights.

He moved the vehicle forward a few inches, reversed a little then remained stationary for a few minutes as some more vehicles left. At last he pulled out of the car park and 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, 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! Dumfounded, the officer said �I�ll have to ask you to accompany me to the police station as this Breathalyzer equipment must be broken�.

�I doubt it,� said the man �Tonight I�m the designated decoy�.