I’ve never felt so embarrassed in my life. When I mistake somebody, I say Sorry I thought you were someone I knew. Or while, I fell down the steps in front of many people, it doesn't make me feel. But When I was about 15 years old, at mathematics classes, while, a teacher is teaching, I just suddenly get up and speak language at nobody understands. I speak about 2 minute and then walk around the room and walked out. After quit studying, my friend said, what have you done? The teacher and friends very confused, why you get up acting weird. I said, I have no idea of what happened there. I don't know nothing. My friends laugh out loud. Thinking about that day makes me blush.