Many times, with the worst being tweaking my chronically problematic back. Early this year, it was bad enough to limit me for about 6 weeks, and physical therapy was part of the recovery. Once I did what the OP is describing while trying to remove a square taper, drive side crank arm. The difference being that when I lost my balance, I raked my left, front forearm across the big chain ring. It was one of the nastiest looking, jagged scratches I have ever had, from just behind the wrist and into the elbow. Man, that hurt, and bled really bad.