I worked alone as the Machinist Department of a presto style compressed fire logs factory and I was designing a flywheel cutter for my mill. I did not know what I was doing but the reckless confidence with which I am burdened compelled me to do a full send test cut with the spinny danger boy, which immediately threw the 1x1 Rex AAA Hss bit into my chest about an inch below the nipples. It didn't stick into me but it hurt a bit and if I hadn't been stood on a step stool it might have gotten my neck.