Stand up

A college professor met his new class on the first day of school. He stood before them and gave a nice introduction to the class and about himself.
 Upon completion of his monologue he looked around the room and asked his students "If any of you think you are stupid, stand up." As he looked around he saw that all of his students did not stand.
 He proceeded to ask the same question again, "If anyone thinks they are stupid to please stand up."
 The college professor looked around and to his surprise one tall student in the back of the room stood up. The professor asked, "Do you think you are stupid?"
 The first year student replied, "No, I just didn't want you to feel alone."