. . . even though I'd never even think of trying to emulate them!
The Red Bull Rampage is an annual mountain bike competition held near Zion National Park in Virgin, Utah. It's developed a reputation as one of the most difficult and challenging events of its kind. Here's a video clip claiming to be the 'Top 5 Moments' of the Rampage over the years.
And here's another of the 'Top 5 Crashes'.