The cost of a piece of metal in your eye.
Been there twice....you think I would have learned after the first time .....The second time was with a dremel and I thought about putting on my glasses before cutting but I was in a hurry and it was just a tiny like 1/4 long cut...well, what could happen in that short amount of cut? ....Wrong......Anymore I wear safety goggles all the time....they are better than glasses as pieces can't come in the edges on you either....