Wow, that's pretty brutal. My brothers and I are all about 6 or 7 years apart and we really didn't wrestle with each other too much. I did that with all my friends.
But one time my one friend was over and was antagonizing my younger brother. Well Dean flipped out and went on a rampage. He picked up a 7" knife from the kitchen and chased us around the house screaming at the top of his lungs tears pouring down his face. Scared the crap out of me, I just remember locking myself in the bathroom until he calmed down. But he was beating at the door for awhile. It was like the Shining. :P
We all swore we would keep it between ourselves but I guess it really bothered Mike cause one day at dinner he mentioned it to his father. heh