500 Buck Bet

A woman was walking down the street when she was approached by a man.
The man said, " I want to have SEX with you right now!"
"I'll drop 500 dollars on the ground at your feet and in the time it takes for you to pick it up I will screw you from behind and be on my way!"
The woman thought it over and told the man to wait a minute.
She called her girlfriend on her cell phone and told her about the man's proposition.
Her girlfriend said " When he drops the $500 on the ground I'm sure you can pick it up and run before he gets his pants down. Call me back and tell me what happened."
An hour and a half later the lady called her girlfriend back.
"What happened?" the girlfriend asked.
The lady said "That Son-of-a-Bitch had $500 in quarters."