Sam is your classmate, he is the smartest of the smartest in your school. One thing you don't like about him is he always has an attitude aside from that he is also selfish. One day you asked him to explain something to you and he said this.

"This was in yesterday's lecture, right? How dumb are you."

He refused to help you, you expected this from him since he is often called 'rude' or 'selfish' but you just thought he had reasons.