Anything with horses.
Agreed anything with horses seems to be a high risk. I've saw an entire pack string explode in the Bob Marshall because someone stood up too quickly. Gear scattered across the forest. Took 4 hours to find most of it and the animals. Luckily nobody was saddled up
Different trip and outfitter, one horse didn't want this particular animal behind him so he kept bucking to kick the follow horse. Tossed the rider off and luckily there was a hill on the side the rider fell off so he only fell a couple feet. Rider chose to walk the remaining 11 miles to camp. Same trip, the outfitter close fist punched a horse...like Mongo from Blazing Saddles.