Anything from kitesurfing, snowkiting, powerkite etc etc!
Better yet, tips on how not to inflict the same injury!
Mine: Trimalar fracture on the ankle
How did it happen: Jump, one foot out, other not. > impact > board turning 180 degrees with foot still in it > CRAAAAACKKKKK
What was so bad: having the crack my ankle back to the original position and body dragging back to shore.
How to prevent it: STRAPLESS riding

Let's hear the next epic fail?