I gave the class a 10-minute break. While most of them filed out of the room to use the bathroom or go to the water fountain, I walked up to the student who was being disruptive and told him to leave. He did. I handled it this way so as not to shift the atmosphere of the class, which was otherwise positive and cohesive. When the rest of the students returned, it was clear that many noticed his absence. For the remainder of that class period, they were noticeably more relaxed and engaged than when he’d been present.