Never ride a mountain bike down the side of an icy mountain, not even a little bit in the beginning.
Because the beginning is the most dangerous part—well, after the downhill slalom that shoots you across a field of jagged rock. That's probably the most dangerous part, actually.
What you're looking at is a bike race/death slalom called the Megavalanche. It's a mountain bike event that runs down Pic Blanc—a section of Alpe d'Huez in the French Alps—and it is only for crazy people unafraid of death by blunt force.
If you're heard of Alpe d'Huez before, that may be because it's considered the most grueling mountain section of the Tour de France—a climb that takes riders past the tree line and high enough to start seeing collections of atmospheric snow.
On the road (which cuts back and forth for safety and ease of travel), descents from this height can reach speeds in excess of 50 mph. So keep that in mind as you're watching these mountain bikers descend an ungroomed course of snow, slush and rock.
If it's any indication of what's being undertaken here, our racer/observer runs over a guy in the first five seconds and still finishes in seventh place.
Never do this.
Dan is on Twitter. He's been run over by a bike before and can confirm it's as fun as it sounds.