A man walks into a bar, late one night completely knackered

A man walks into a bar, late one night completely knackered
and dripping with sweat and orders 5 whiskies.
"What's wrong with you?" The barman says.
"In my car I've got a nymphomaniac - you couldn't satisfy
her if you were there 'til Christmas," he replies.
"We'll see about that," says the barman and goes out to
the car park.
He has been in the car with the woman for a while when there
is a knock on the window and a policeman shines his torch
in. The barman jumps up and winds down the window to talk to
the policeman.
"It's all right officer, I'm just shagging the wife," he
says.
"Oh, I'm sorry sir, I didn't know it was your wife"
replies the cop.
The barman replies -"Neither did I 'til you shone your
torch!"