A guy goes into a house of prostitution.
He selects a girl, pays her $200 up front, then gets undressed.
She's about to take off her sheer blue negligee, when the fire alarm rings!
She runs out the room, with his $200 still in her hand.
He quickly grabs his clothes and runs out after her.
He's searching the building, but the smoke gets too heavy, so goes outside looking for her.
By this time the fire brigade are there.
He sees a fireman and asks, "Did you see a beautiful blonde, in a sheer blue negligee, with $200 in her hand?"
The fireman says, "No!"
The guy replies, "Well if you see her, screw her. It's paid for.