OK, I just happened to see a video on YouTube where a guy had a discharge while chambering. It was some type of .32, I believe, and he'd been having troubles with FTFs so he was working on it in his shop. He racked a round and the gun discharged - no trigger involvement. During his follow up he explained that it appeared that the firing pin had gotten stuck in the energized position, made contact with the round and fired. Anyone ever heard of this happening (outside of this video example)? If so, are there certain semi-autos that would be more prone to this or is this really just an isolated case of an under-maintained firearm causing problems?