"Pick-Up Attempt at a Bar" joke

A very shy guy goes into a bar and sees a beautiful woman sitting at the
bar. After an hour of gathering up his courage he finally goes over to her
and asks, tentatively, "Um, would you mind if I chatted with you for a
while?"
She responds by yelling, at the top of her lungs, "No, I won't sleep with
you tonight!" Everyone in the bar is now staring at them.
Naturally, the guy is hopelessly and completely embarrassed and he slinks
back to his table.
After a few minutes, the woman walks over to him and apologises. She smiles
at him and says, "I'm sorry if I embarrassed you. You see, I'm a graduate
student in psychology and I'm studying how people respond to embarrassing
situations."
To which he responds, at the top of his lungs, "What do you mean $200?"