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Sam 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 three Viagra pills to satisfy all three of them."
The doctor replies, "You know three Viagra pills three nights in a row is pretty dangerous for a man of your age. I will give them to you on the condition that you return to my office on Monday so that I can check you out."
Sam says, "You have a deal Doc."
Monday morning, Sam returns with his arm in a sling.
"What happened?" the doctor asks.
Sam answers, "Nobody showed up!"
