The Impossible Bike Obstacle Course

How do you make a bike obstacle course so difficult that the best riders in the world can't do it? Red Bull seems to have cracked the code. First, you float it over water, so there's always some wiggling going on. Then you make the true course as narrow as possible. That way, if you waver, deviate, or fall, you can't just get back up because you're in the water (and so is your bike). They tested this ridiculous obstacle course with a bunch of BMX pros, with results that can be described as pratfalls. 

then they challenged renowned cyclists Danny MacAskill and Kriss Kyle. These are the guys who will try it over and over again until they succeed. But will they? 
(via Laughing Squid)