Many, many, over 20 years of climbing. The first (and worst) was solo aiding toes of the fisherman at smith, clipping above me (really dumb), ripped the piece and ended up 12" above a cone of rock at the base, my lower back directly above it (the boulder to the right of Wortley's). With rope stretch...luckily I was only 20' out. Welded a #4 stopper which someone eventually got out (much to my relief, I hated walking by and seeing it.)