Should have been on the "bad joke" thread
A policeman on his beat comes across two men, on lying face down on the pavement with his trousers pulled down exposing his backside, the other kneeling next to him with his finger up his mate's bum.
"'Allo, 'allo, 'allo; what's goin' on 'ere?", he said.
"Well officer, my mate's collapsed because he's had too much to drink, and I'm trying to make him sick."
"You'll never make him sick putting your finger there" said the policeman.
"I will when I put it in his mouth".
Jim Carroll