I agree dfleming-I had an aggressive bipolar child once who walked around tearing all the heads of the stuffed animals in the room. I had a student once who ended up with 5 different diagnoses including ODD, autism and bipolar. He would run out of the room, throw everything off my desk, pull all the kids' work down of the walls. Was it frustrating-of course, was my admin supportive-no, but not only did I never lose my cool, I managed to create a classroom community where the kids would still be friends with them. There is nothing a child can do that would deserve the way that child was treated (unfortunately I have seen the video many times as it is on a loop on the local news here). Beyond causing physical and psychological harm to that child, it's a terrible example to be setting for the other kids. If you get upset with someone, just beat them up. You're the adult-there's no excuse.