In regards to the table saw thing, I still remember a friend of mine in High School shops class cutting a 4x6 piece of oak. The blade caught and launched the lumber. The problem was, he was standing right behing the piece, pushing it along with his elbows in his gut to help push. It caught him in the gut and he flew about 6 ft back into the wall. To this day I am still amazed he didn't crack a rib or anything. Other than getting winded, he was fine. Very lucky. And a great reminder to me never to stand right behind the piece being cut.