We all have at least one...
I was riding with my Brother-in-Law, cut a curve a little tight, some "genius" had cut an 8" deep, by 8" wide ditch beside the trail, of course my front wheel hits it, and stops moving, me and the rest of the bike keep moving, I go right over the bars, and land on my face. The bike was okay, I mashed some the nerves in my left arm, and got a lovely hematoma, which needed to be drained. This was along with various road rash on my face and other places. The only good thing, gave me a reason to grow a beard while the road rash healed

This was the last time, I actually rode off road, too dangerous, I'll take my chances with the cars.