Yeah, I remember the time I rode my bike down a hill and hit a ramp that had a 60 degree incline. No, it didn't work very well... I smashed my head against my handle bars, flipped my bike, and landed on my back. I don't think I was able to breath for a good 20 seconds.
Ok, where am I going with this?! I saw this on Gizmodo today. Now this is what I call knocking the wind out of yourself. Imagine doing that on national TV? You just have to laugh hearing the commentary afterwards.