I hit myself once with my baja 5B. Was my first bash session, in the wet/snow. A 5B does not stop quick on wet blacktop! The RPM bumper peeled the skin back on my shin like a potato peeler. I also stiff armed an LST2 mid flight coming at my head when I used to bash with some guys at an indoor motocross track. The thing was going full tilt and went off the jump wrong right at my head. Have no idea how I got my arm up in time. Hand was mostly numb the rest of the night and my forearm hurt for a week!