The cost of a piece of metal in your eye.
Another thing that sucks, is when your using a chop saw and it spits out flaming red hot balls of burnin metal in your eye's. It burns like heck, and sends you crying to the sink.. Then people are trying to figure out whats going wrong inside the house o_O ... And you can hear the tttsssssss sound of the burning metal inside of you, unless thats just me.