A guy goes to his doctor and says, "Doc, I have a problem. My girlfriend is sleeping over this Friday, my ex-wife is sleeping over this Saturday and my wife is coming home Sunday. I need 3 Viagra pills to satisfy them all.
The doctor says, "You know 3 Viagra pills 3 nights in a row is pretty dangerous for any man. I'll give them to you on the condition that you return to my office on Monday so that I can check you out.
The man says, "Youve got a deal, Doc."
Monday morning the man returns with his arm in a sling. The doctor says, "What happened"?
The man answers, "Nobody showed up!"