Searched but haven't found it, so
A man goes to the doctor and says "I've got a pain in my rectum"
So the doctor gets him to drop his trousers and has a look up his arsehole - he sees a £20 note, so he pulls it out, then he sees another, and another and another and so on until finally he puts down £1995 quid on his desk.
He says to the man, "did you know you had £1995 up your arse?",
"Ah, says the man, I knew I wasn't feelling too grand."
(dchurch bah, Mon 19 Dec 2005, 15:11, Reply)