Probably had a couple instances where a long gun leaning against something tipped over. I know of one for sure, when crossing a fence. Shotgun leaning against the fence a couple of posts from where I was crossing, post I was crossing at broke and caused the shotgun to fall.
I've dropped my P238 twice, once loaded and once not loaded. When it wasn't loaded, I had to crawl under my Jeep for some reason. Took it out, unloaded it and tossed it on the seat. It bounced off, hit the threshold plate, bounced again, onto the pavement.
Other time, when it was loaded, I'd hung a tarp to catch brass with the bottom laying on the bench. I'd piled my bag, gun cases, etc on the bottom of the tarp to hold it down. At some point everything had been moved and the only thing still on the tarp was the .380 and it's box. Tarp caught some wind, flipped box and gun right off onto the ground.