goodness, i think most of us have. those things are sharp!! i cut my thumb, into my nail. it bled for over four hours but by the time I went to the emergency room and sat for another hour it has stopped. they put tons of gause around my finger, no stitches.
i wore a metal finger guard for over a month due to the nerves hurting eveytime i touched something.
now, i had a plastic guard on my long ruler that would have saved me- but i had turned it to the other side without the guard by mistake!