Murphy calls in to see his mate Paddy who has a broken leg.

Paddy says, "Me feet are freezing mate, could you nip upstairs and get me slippers?"

"No bother," says Murphy. He runs upstairs and finds Paddy's two stunning 19 year old twin daughters sitting on their beds.

"Hello dere girls, your Da' sent me up here to shag ya both."
"Fook off you liar!" they giggle.

"OK, I'll prove it den," Murphy says, and shouts down the stairs,"Both of them Paddy?"

"Of course, what's the use of fookin' one?"