While his wife plays the slot machines, the business man checks into the Atlantic City Casino. As the bell man takes the couple's bags he asks the businessman if he'd like some female company. The man declines the offer, but mentions it to the wife. Curious, she suggests he call down and say that he has changed his mind, just to see what'll happen.
A few minutes later a knock comes at the door, and the wife hides in the closet. The man lets the call girl in. She is a fantastic blonde, tight blue dress, in her early twenties. After a minute or so of pleasantries, learning that she is a medical student making her way through pre-med school, he asks what her going rate is. Five hundred dollars, she replies. Too much, says he. I was thinking more along the lines of Twenty dollars. She shakes her head and leaves. The wife is all excited and can hardly wait to get her husband into the bedroom.
Afterwards, they go down in the elevator to hit the buffet. The elevator stops several floors before the casino and the call girl gets on. She looks at the man's wife, leans over and whispers in his ear: "See what you get for $20?"