The man pleaded with the doctor, saying he really, really needed it
The doctor asks him why
The man said, “my girlfriend is coming into town on Friday. My ex-wife is coming into on Saturday. And my wife is returning in Sunday. Can’t you see? I must have a double dose of Viagra”
Finally the doctor relented but said he needed to check him on Monday morning to see if he had any side effects of the double dose of Viagra
On Monday the man dragged himself in, his arm in a sling. The doctor asked “what happened to you?”