Another good one is the time I was standing on a small, stout wooden crate. it suddenly kicked out from under me and I whacked my shin perfectly right across one of the hard, sharp corners with my full weight as I fell. That hurt so bad I couldn't even move or cry out for a minute. I probably would have broken a leg if my bones weren't so dense. I still have a lump on my leg there to this day and that happened well over 5 years ago.