being a stooopid apprentice carpenter i always cut my hands, got finger nails torn off and that sort of thing. the one i remember as the most severe was when i was in the joinery shop. i had two layers of 3/4 ply on top of each other, at a ninety degree angle to a 20" radial arm saw. as i pulled the saw towards me, to make the cut, the plywood slid sideways and pulled my hand to the blade. thumb nail gone, about a dozen stitches beteen the two knuckles. very lucky to have my left thumb. it's a bit difficult to enact revenge on a tungsten tipped blade spinning at about 5000rpm, so the saw won. a week off work with pay was ok.