This is my bike, except mine is silver. I really only do trail riding though.
A few weekends ago, I was on a trail... had just gone over a man-made ramp (mad air) and came upon a large root which i attempted to pop over, but apparently my front wheel had come loose and it completely fell off the bike as I tried to land. That sucked. Like a minute later some punk-ass 10 year-olds hopped the root no-problem... showoffs. And of course the cliche biker guy rode past in full spandex gear asking "got everything you need, brah?"
All of my friends who got me started in mountain biking have stopped due to injuries. A friend in college got run off the road by an asshole in a car and broke his day-old bike as well as his arm. So I guess biking is probably one of the most dangerous activities known to man.