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 will 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, "You have a deal Doc."

Monday morning the man returns with his arm in a sling.

The doctor asks, "What happened"?

The man answered, "Nobody showed up!"