Probability of a modern shotgun going off completely by itself?

I own a budget 12 gauge (Rock Island Armory M5) and a S&W SD40. The SD40 I keep in condition 0 at all times whether it's being carried on me, or resting in my nightstand. I just think the trigger should have some kind of guard like the holster or drawer - as to the best of my understanding, there's no way in Hell a modern handgun will "just fire" without the trigger being pulled. Mine is drop safe too as most are so I don't worry about that happening at all.What about shotguns though? Does that truism equally apply? I've heard stories of shotguns going off without being dropped, trigger pulled, or handled at all. I have never seen this with my own eyes but I imagine that these stories are absolute freak occurrences, like as in you're more likely to be killed by a random anvil falling from the sky or a being struck by 2 consecutive meteors. But I'm no expert or authority, and I've heard about these stories enough that I'm somewhat hesitant to leave one in the chamber.At the moment I store my 12 gauge in a Pelican case flat on the ground, with rounds in the mag, safety off, and nothing in the chamber. It is also relatively clean; oiled frequently; flat on the ground and not situated on top of a furnace. And again, it is cheap, like $200-300 - but qualifies as a modern shotgun. Also, no children to worry about at my place.So what's the redpill on this topic? Again, specifically for shotguns. Is this probability just greatly exaggerated by liberal anti-gun propaganda? Or should I keep one in the chamber and instead worry more about being hit by a sky anvil? via /r/CCW https://ift.tt/2LIKHwm