Was riding Big Sky in Montana about 6 years ago. It was one of our last days there and we had gotten a dusting the night before.
We got to the top of the mountain around 9 AM and had a blast cruising through the soft stuff. My buddies took a looping route around this one section and I continued straight down this one side of the ridge and found this huge patch of (what I though was) untouched powder.
I took a few turns in it only to realize I was trying to carve through a massive section of skree, with sharp rocks the size of footballs which were sitting just underneath the snow. To escape, I banked on my heel edge and tried to straight line it to the side, which was probably the worst idea I could have had. I should have just stopped, unbuckled and walked out.
I ended up gaining too much speed, clipped a rock with my edge and tomahawked twice over these rocks. I should have broken my back, but luckily I was able to walk away, severely bruised along my lower-upper back. I managed to shuffle down to the traverse below this section where my buddies were waiting and we gently skated to the next lift where the liftie was able to call a snowmobile to take me down. I couldn't sleep or walk the right way for a couple weeks after that. It hurt a lot.