Yeah that's a classic clip from Kris Holm, my main sponsor, and one of the original pioneers of the sport of MUni (Mountain unicycling). He basically inspired me to get into off-road unicycling back in 2006, and I love it now more than ever!
Here's a compilation showing a variety of riding including 24", 26er, 29er and 36er, doing rocky technical, big drops, high speed riding, etc. Btw, how do you embed youtube videos?
https://www.youtube.com/watch?v=foP23CONoHY