Yeah. I've seen him and the aftermath of him beating the hell out of people(the guys face, ambulance, etc.)... He has one hell of a temper. It wasn't as bad after he had surgery. It took alot out of him. He's 64 and still works 8-5 and runs circles around the guys that work for him. When he was in his late 40's and younger, one wrong word and he would snap.
Edit: I no longer live at home either, so it's not like i'm afraid one day i'll get knock on my door and a punch in my face.