When I met the principal he read it, laughed, tacked it to the board behind him and sent me back to class with no punishment. I learned that you have to hold onto the handle of a knife very well. If it slides down, bad things happen. I severed the tendon in my right pinky. I hit F11.
Knives are sharp, a harsh lesson to learn three years after puberty.
Teaching my younger cousing to swing a baseball bat yearned a powerful lesson. Keep a distance. I can still hear that aluminum bat cracking on my forehead. I remember when I was real young I took apart the concrete steps with a ballpeen hammer. I was whacking on the first step for almost an hour before someone heard me.