Jan was in class and her teacher asked them a question and Jan knew the answer so Jan raised her arm.
I had to raise my arm in class for that question because I had just studied the answer the night before. You were so enthusiastic about it that you almost jumped out of your seat! I know, but I just wanted to show the teacher that I am participating in class. I think you definitely proved that point. I wasn't too much of a show-off about knowing the answer, was I? Some of the class was laughing at you, but I think they were just surprised by your ambition.