Not The Way To Prove Your Point

I was watching tv last night, and my brother was just walking around making strange noises and throwing things. This really pissed my sister off, so she said to him (in the nicest way possible), "You need to go on ritalin or something." When he heard that, my brother picked up a stool and yelled, "I'm going to beat the crap out of you!" in a misguided attempt to prove to my sister that, indeed, he could control himself. Now, I may be wrong, but if the accusation is that you're too hyper to live a normal life without the aid of drugs, then I don't think it would be the best idea to argue against that point by making threats of physical harm. Just a thought.