A man went to the his doctor.
"Doctor, I want a 100 dose prescription for Viagra. You see, there is an orgy this weekend, with twenty beautiful blondes and just me. I really want to perform well." The man said.
"I cannot do that." The doctor said. "Nobody has ever had that big of a dose before, and nobody knows what the side effects might be."
The man persisted for 15 minutes until finally the doctor gave in.
"Ok, I will give you the prescription with the promise that you will come back in on monday so I can give you a complete examination." The doctor said.
"GREAT!" Said the man.
On monday the man walked back into the doctors office with both arms in a sling.
"What happened?" the astonished doctor asked.
"Nobody showed." Said the man glumly.