The cops are waiting outside a pub. A bloke comes staggering out and meanders towards a car, fumbles in his pocket, and pulls out a key. He stares at the key, then smacks it into the door. After the 4th attempt, he finally gets the key into the door lock. Falls into the car and, after three times stalling the car, carefully backs out of the car park and starts driving down the road at about 15 mph.
The cops look at each other and think "RIGHT! We've got our man!!" and start following him.
He continues down the road, round a corner, down the straight, left, right, and finally slips into a drive, all at 15 mph.
Meanwhile his mates get into their cars in the pub car park and drive home.
The cops pull up behind the man in the drive. , shine a light into the car and say "Good evening sir. Would you care to step out of the car? "
The bloke steps out of the car, straight as a rod.
"Have you been drinking, sir?"
"Nope"
"Blow into the bag, sir"
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Cops are mystified. "We saw you stagger out of the pub, struggle to put the keys in the lock, stall the car 3 times and drive away at 15mph. How come you've not been drinking?"
"I'm the designated driver tonight"
