Extreme Water Slide

This video of a man on an extreme water slide has gone viral recently...

As soon as I saw it, I knew it was fake. My tipoff was the audio, from the friction of his body on the slide to his landing in the water. From the distance of the camera, there's no way it would have picked up that sound, and there's no chance that an "amateur" video would have been miked this well. Here are some details on how they did it, as uncovered by the blogosphere.