Scandal in the library.

A guy asked a girl in the library: “Do you mind if I sit beside you?”
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 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 boy whispered in her ear:
“I study law and I know how to make someone guilty!”