Something very similar happened to me a few years ago. Hiking into a duck hunting spot with my dad, with him walking in front of me. Somehow as we were walking brush managed to flip off my safety, and then pull my trigger. I was carrying the gun with the butt up against my thigh, pointed away from my father. If I had just been carrying it straight, I would have shot him through the low back at 5 yards and watched him die in front of me. As it was I missed him harmlessly by a few tens of degrees. All the same, I literally collapsed shaking in fear and adrenaline.
THEY'RE ALWAYS LOADED, AND ALWAYS ABOUT TO GO OFF! ALWAYS ALWAYS ALWAYS.