I actually got in a really bad ski accident somewhat due to snowboarders before.
Basically, I was going down a trail, one I've been down many, many times and it has a large jump on it mostly for snowboarders (that go off of it at a flying 5 mph). There was a group of snowboarders, a couple on each side of the jump, meaning you had to go over it if you were to continue going down the trail. They didn't do this on purpose, but since it was the top of the hill and that's what you do when you snowboard...Anyways, it wouldn't have been a problem except I was going really fast and it was very icy that day, and the jump kind of sneaks up on you. I would have had plenty of time to change direction and avoid the jump, but not enough to slow down enough, and I didn't want to go off the jump at a weird angle so I just flew right off of the damn thing. Unfortunately, I've never been much of a height person and had no idea WTF I was doing at that point.
Broke both bones in my left forearm and my hand/wrist was shifted over to the left a few inches. When I woke up I thought my back was broken due to it hurting so bad, and to this day I have neck/back problems.
Of course, that could have been avoided by me just as much as the snowboarders, and if I could go back I would have tried to stop, but I didn't have enough time to think. To their credit they were the first ones by my side.