Mythbusters? There is actually a TV show that debunks things on the internet? Yawn. I usually look at snopes.com. Who mythbusts the mythbusters?
Not necessarily just things on the internet. They try to disprove lots of urban legends and such. It's actually kind of fun to watch, as it usually involves crashing things, blowing stuff up, or launching things. As for disproving the video you posted, they found out that they could get a human off the ground, but not really launch them like that.