A fellow's wife was very worried about her husband's heavy drinking and one night she decided to give him a fright.

She draped herself in a white sheet and went down to the local cemetery, knowing that her husband was in the habit of taking a shortcut through it on his way home from the pub.

It was not long before he came staggering along, and out she jumped from behind a headstone.

"Ooooooo!" she wailed, "I am the Devil!"

He sticks out his hand, "Put it there, pal," he says, "I am married to your sister."