No One Showed Up

An elderly man went to the doctor's office to get a double dose of viagra:

The doctor told him that he couldn't allow him a double dose.

“Why not?” Asked the elderly man.

“Because it's not safe.” Replied the doctor.

“But I need it really bad.” Said the man.

“Well, why do you need it so badly?” Asked the doctor.

The elderly man said

“My girlfriend is coming to town on Friday, my ex-wife will be here on Saturday and my wife is coming home on Sunday

Can't you see? I must have a double dose.”

The doctor finally relented saying

“Okay, I'll give it to you, but you have to come in on Monday morning so that I can check you to see if there are any side effects.”

On Monday, the elderly man dragged himself in with his arm in a sling.

The doctor asked

“What happened to you?”

The elderly man said

“No one showed up.”