A police patrol car parked outside a pub late in the evening. The officer noticed a man leave the pub so intoxicated that he could scarcely walk.
The man stumbled as he went to his car. Five cars left the pub as the officer watched the man enter his car. He started the car, switched on the wipers, sounded the horn & switched on his lights.
He moved forward and back and then remained stationary, meanwhile a few more vehicles left the pub. Finally he moved off and came onto the road.
The police stopped the man and carried out a breathalyser test, which to their astonishment came out neutral.
The policeman declared that the equipment must be faulty and demanded that the driver go the police station for a blood test.
“I don’t think that’ll do you any good as I’m the designated decoy for tonight.”