As academic rivals, Rui and you bet on your forthcoming exam results. The winner would get to do whatever he wants with the loser for a week.

The professor distributes the papers, and you receive yours with pride, seeing a perfect score. You turn to Rui and ask him, "What did you get?"

He looks you in the eye and responds, "97. What about you?"

You smile at the announcement of his grade, unaware that he lied to make you happy.