There's an Olympic Park in Calgary I snowboard at a lot. Its on the side of a large hill that spans across the town and this one time it was a really windy day. It had caused alot of the snow to turn to ice. For some stupid reason, I decided to try out the Half Pipe, which is atleast 2 stories high. It's coated with ice to ensure it doesn't chip, but this day it was especially icy. I rode in and started riding the walls of it but as I was coming up one side, as I turned back down, I caught an edge and basically fell a good distance landing my back on ice. I just laid there for a few minutes trying to get the urge to stand up.
The same thing happened my second year of snowboarding, when I wasn't too great at going off jumps. I went alot faster then I should have and launched off a decent sized jump, and fell backwards resulting in landing my back on ice.
It hurts a lotttttt more then just like..falling off a bike or skateboard. The pain eventually goes away but bites you in the carp for the following few days.
And ughh these occasional times if I lay in some extremely awkward position at night it moves this muscle in my legs (the huge one thats on your ankle), but its usually when I'm awake and I just roll my leg over or whatever. But one time I woke up to find that my muscle had like..moved out of place and I had to push it back into place. The pain was pretty unbearable, it felt as nasty as you could imagine.