Yesterday, I was working on a friend's bike and was starting a test ride. A pedal come off the crank when I stood up and stomped down. The way the threads are boogered up makes it look like it wasn't screwed in all the way, though I did not notice this before the ride, though I called myself checking it. I had been working on a sticky shifter cable. Has anybody else performed an unplanned dissassembly of their bike using riding techniques? (Wrecking the bike DOES NOT count!)