he, he. i was using my long 24 inch ruler that had a plastic glue on guard on it, but of course i picked it up and was cutting with the opposite side. somehow the rotary cutter went over the lip of the ruler and into my thumb. took four hours to stop, no stitches but nerves were hurt. wore a metal finger guard awhile. Still don't have cutting gloves.
my cutter retracts automatically, so that is good.