A withered old hag finds a young man about to jump off a bridge.
"Tell me young man - what in the world is so terrible that you want to end it all?"
"Well," says the young man, "I've just been fired from my job, my girlfriend has left me and I'm about to be evicted from my flat."
"That's terrible," says the old hag, "What would you do if I told you I was a powerful witch, and I could get your job and your girlfriend back, and stop you being evicted."
"That would be amazing," said the young man, "can you do it?"
"Yes - but at a price!" says the old hag.
"What do I have to do?" asks the young man.
"Come home and have sex with me all night long - and if you can make me ****** at least 5 times I'll grant your wish." the old hag replies.
The young man looks at the old hag, ugly fat and wrinkled as she is, and reluctantly says "well if it'll get my life back to how it was it'll be worth it."
So they go back to the old hags house, and he spends all night pleasuring the woman.
After several hours, the old woman finally has her fifth ****** - and immediately the young man gets up and starts to get dressed.
"Tell me, young man, how old are you?" says the hag.
"I'll be 29 in a couple of months time." he replies.
"29 hey? A bit old to believe in witches aren't you?"