Last year I was extremely irritated with the mother of Little Johnny, the most violent, emotionally disturbed boy I have ever encountered.
He used to scream at me, curse at the class, intentionally hurt other children and he was a danger to me, the class and himself. Nothing could reach this boy. He was extremely intelligent and when he had control of his behavior, he was an academic superstar and great. However, those times grew fewer and fewer until he was failing all subjects because he would refuse to work, preferring to cause a non-stop disruption.
I don't believe he was being abused, but had a chemical imbalance and felt left out because Mom had remarried and he had a half brother that probably got a lot more attention.
He was also VERY large (I'm 5'6 and he came almost to my shoulder and weighed well over 100lbs of muscle, not fat) and was strong enough to throw chairs and turn over desks.
After he grabbed my arm, held on tight, then threw himself to the floor nearly wrenching my shoulder out the socket, I was advised by the administration to call the office the second he started going off.
At first they were reluctant, then after he tore a chunk out of another child's arm, they began to suspend him left and right.
His mother hated when he got suspended because it meant he was at home all day with her (she was a stay at home parent) so she would beg me not to tell the P when he acted up. She asked if it could be our secret and if instead of me calling the office when he was kicking my desk and screaming at me, if I could just send a note home.