A young man was making love to his girlfriend on the back seat of a car when suddenly there was a knock on the window. Startled the young man lowered the window to find a policeman standing there.
The policeman asked the young man to step out of the car, and tells him he is committing an offence, but adds he is prepared to forget this incident if he can be next.
The young man agrees and gets back into the car with his girlfriend.
A few minutes later he gets back out again shaking like a leaf.
The policeman asked him "What's the matter?"
He replied