There's helmet cam footage online of some downhill mountain bikers, who probably should have checked out the course before they went gung ho on it.
Near the beginning of the course, the guy with the helmet cam goes off a jump. Then he goes off another one, but it turns out it's not SUPPOSED to be a jump. He was supposed to make a hard left turn down some steps.
But instead, he jumps OVER the steps, completely leaves the fenced-off course, and lands in some bushes about 10 feet down.
Then he turns around in time to watch the guy behind him do the same thing. And in all, four different riders get tricked.