A shy guy in a crowded bar is trying to work up his nerve to talk to a beautiful girl sitting nearby. He finally goes up to her an quietly says, "Excuse me, can I buy you a drink?" She looks at him and in a voice loud enough for everyone to hear, says, "No, I won't sleep with you!"
The guy is horribly embarrassed and returns to his bar stool. A few minutes later the girl comes over to him and says, "I want to apologize. I'm a grad student in psychology and am studying how people react to humiliating situations. I'm really sorry for doing that to you. Can you forgive me?"
In the same loud voice she had used, he looks at her and answers "$200! No way!"