John joined Fred at the bar of their local pub and Fred couldn't help but notice his friend's long face.

"Hello, mate. How's your love life?"

"Brilliant," answered the handsome fellow as he sipped his pint. "I'm getting laid every night, but I'm worried."

"How so?"

"I just got a letter threatening me if I don't stop screwing his wife."

"Well, that seems reasonable," said Fred in a cheery voice. "Why don't you stop seeing her? That will solve your problem."

John frowned and spread his hands.

"No, it won't. The bastard forgot to sign the letter!"