I'm not yet a mommy to a 4 year old, so take my advice with a grain of salt! You mentioned that he is high energy (which I'll imagine most 4 yo's are!) Is he getting LOTS of outside/physical playtime? That may help prevent some of the crazy behavior inside, yk? As far as dealing with the laughing, you know, sometimes kids laugh for other resons besides just trying to be aggravating. Once I lost it and spoke really firmly to dd, something I'd never done. And she laughed. Partly I think because it made her nervous and partly because she was trying to difuse the situation and 'make it feel better', at least the way she knew how. It worked because I immediately realized that I was wrong to have spoken to her that way and we both had a good laugh. Not saying that you should just laugh it up everytime he laughs at you, but just sharing how dd reacted to stress. With regard to the hurting, with dd I say "I will not let you hurt me/the cat/baby/ect. Here is how you can be gentle/play with the cat/baby/ect." I know she knows gentle touches, but I give her the benefit of the doubt and show her anyway. Sometimes it's to get my attention, and knowing that she can have my attention if she is just a bit more gentle is all she needs. If I feel that is what is going on (if she's also showing other seemingly aggravating behaviors like crawling on me, interupting, ect) I will say something like "Abby, do you need mama's attention? Just say, 'Mama, I need you', and I will certainly listen" Or sometimes, if I can't be interrupted (if I'm on the phone with someone important, not often, but rarely) I will scoop her up in a big bear hug or play a quick game of chase or tickle her. All these can be done with little to no talking. HTH