Back when I was still working, I would try to get a little sewing done before I went to work. I was in a hurry, using the rotary cutter. I had the edge of my finger to close to the edge of the ruler. I neatly sliced off a little pad of skin on my left pointer finger. I didn't feel it right away, but managed to get my hand away from the fabric in time to prevent bleeding on it!. I sure learned a lesson that day!!
Ditter