He used to hit himself in the head when he was younger when he would get frustrated. He would also sometimes get in fights at school over misreading social cues. He has tested boundaries with me too but never in a violent or scary way. I am sure it's different for each kid because what works on one may not work on others. We just sit him down and explain why he wasn't going to have anything that plugged into a wall or had batteries (games/tv/etc) because of this behavior and he would have to show a difference in how he acted before he got them back and we would also do the best we could in examining why he did what he did.. It's tough on things like that because kids could make fun of him and he didn't understand that is what they were doing or they could just be joking around harmlessly and he would think they were being mean when they weren't. Things like that take time, patience and lots of talking about what happened to get to the reality of what is going on and to try to help him teach himself to differentiate between the two. Having a sister did help with that because being an older sister she would tease or make fun of him so we had a real world example to also draw from so he could know what was what. The hitting himself thing lessened over time when he found other ways to deal with his frustrations and he has seemed to outgrow it because things don't frustrate him now like they did at 8, 9 or even 10 and he hasn't hit himself in a few years. I guess what I'm trying to get across is in helping him understand himself and his relation in how other people treat him and his views on that was very hard but very rewarding for him. He has friends now and doesn't get in fights at school anymore.