I was in Colorado and it was my first time mountain biking. I started off down the mountain and I was going so fast I lost all sense of awareness. I couldn't think to hit my brakes or swerve to cut down speed. I ended up taking the bike sideways and rolling 20 feet on a bunch of dirt. The initial pain wasn't so bad but I am pretty sure I bruised my internal organs which was a bitch for the next week.