I had a pretty serious collision with a tree while mountain biking last month. I was descending a steep, winding trail in Haskill Basin just outside of Whitefish and went flying over my handle bars and landed right on my head (thank you helmut...) I swear the tree jumped out of no where.
I was able to limp away from the cras and ride out but I completely shattered a knuckle on my right hand. I now have two screws in the knuckle and and a cast all the way up to my elbow for the next few weeks. It is a total bummer but I feel very lucky. It could have much, much worse.