A Teenage Stalker?

I substituted at Madison High School today. I passed out a test, sat back in my chair and folded my arms to watch the kids work. I kept the crossed most of the hour and one of the students picked up on it. He mimicked me at the end of class. Everyone had left the room and he stood in front of me with his arms folded across his chest. I told him to leave. The funny thing is that half way through the next class, I noticed him in the hallway with his arms folded across his chest looking in my classroom. He must have had lunch or a pass to the bathroom. If it wasn't high school, I think I would have been creeped out. I doubt I'll see him again.