My story is not quite as spectacular as the previosu ones: no wild dogs, cars, or other people involved--just me, beer, my bike, and a dark campsite by a lake.
Was camping with my family right after i turned 21. At 11:00 all the park lights go out. It was also extremely cloudy, so no stars or moonlight. At 2:00 i really need to pee. Instead of walking through the campground, i took my old mtb. I make it to the privy in one piece, after nearly running into a parked car. I get on my bike as i am leaving and proceed back to the campsite. The campground is pretty big with lots of sites and lots of winding roads. I take a wrong turn and before i know it i'm waist deep in the water trying frantically to find my bike and figure out wtf happened.
The next morning, the dude that lives by the boathouse says he saw me tearing as$ down the boat launch and that I hit the water at full speed and went flying over my handlebars.