In terms of accidental injury, I have no idea. Besides that though, I donated some bone marrow years and years ago because doctors found out I could donate it for one of my younger brothers, who needed it to cure a [i]very[/i] rare disease both my younger brothers had. Anyways, two foot-long, steel needles, into the back of my hip. Although I had anesthesia, I was sore and couldn't do any hard work for a couple weeks afterwards.