She yells, "No, I won't sleep with you tonight, you pig!"

Everyone in the bar stops and stares.

Completely embarrassed, the guy slinks back to his table with a red face.

After a few minutes, the woman walks over to him and apologizes.

She smiles and says, "I'm sorry if I embarrassed you. I'm a graduate student in psychology, and I'm studying how people respond to embarrassing public situations."

To which the guy responds as loudly as possible, "What do you mean $200 for a BJ?"