The girl answered with a loud voice, "I DON'T WANT TO SPEND THE NIGHT WITH YOU!!!"
All the students in the library started staring at the guy, and he was embarrassed.
After a couple of minutes, the girl walked quietly to the guy's table and she told him,
"I study psychology, and I know what a man is thinking. I guess you felt embarrassed, right?"
The guy responded with a loud voice, "$200 JUST FOR ONE NIGHT!? THAT'S TOO MUCH!!!"
And all the people in the library looked at the girl in shock, and the guy whispered in her ear,
"I study law, and I know how to make someone feel guilty.