Wellll,
Since we are admitting screw ups, here is a good one. Up until about a month ago my son and I carry the exact same gun, a M&P9C, we had to go to a free victum zone and placed our firearms in the gunsafe in the truck. Well he carries empty pipe, I carry loaded for bear. When we returned to the real world I retreived (no that's wrong, he gave me my firearm back) re holstered and went on about my business. This was Tuesday. On Saturday we had to go meet a very nice person about a selling him a gun, my sone always rides backup in case of trouble. We pull up and since he carries empty chamber he racked his slide and chambered a round (saw it then but didn't click, I was on red alert. a round hit the floor of the truck (not supposed to do that if you don't have one in the pipe.)). Anyway I got out did my business, smooth transaction and all. Got home and since it was Saturday (my gun cleaning day) I pulled mine out dropped the mag. and racked the slide and NOTHING, no bullet. I thought "crap, what is going on here" got to looking and my son had given me his firearm instead of mine. I would have been screwed if I needed it. After this I always checked my SN before reholstering. Now I carry the M&P40C so all I have to do is look at the slide.