A man went to the doctor to get a double dose of Viagra, but his request was denied.

"Why can't I have a double dose?" the man asked. "It's not safe," the doctor replied.

"But I need it really bad," the man explained.

"My girlfriend is coming into town on Friday, one of my exes will be here on Saturday, and my wife is coming home on Sunday."

"Okay, I'll give it to you," the doctor relented. "But you have to come in on Monday morning so that I can check to see if there are any side effects."

On Monday the man dragged himself into the doctor's office with his right arm in a sling. The doctor asked, "What happened to you?"

The man said, "No one showed up."