I just saw this on Huckberry.com and had to re-post. Huckberry is a daily deals site that right now is featuring some gear from Cadence, Cedar Cycling and Butler Maps.
Anyway, this video is in French but if you watch it you can see how this is done. Very cool!
Original post from Huckberry - http://huckberry.com/blog/posts/89-he-who-walks-on-water