was shot by aaron sorenson and he got some of his inspiration and help from our fan and friend, devon graham> wouldn't you, for aerodynamic purposes, obviously. >> if this thing breaks, something could go horribly wrong. maybe he shot off into the trees. >> that is one of the comments i found on this video. one guy said there is no way you would get me on this thing, because -- if those cables break, you're gone. but hey, why think about bad stuff when you're having this much fun. ♪ >>> at our number five spot, one of the most-watched videos of the year. captured during a bike race in the middle of nowhere. >> get ready for some bone-crunching video. a classic collision between man and nature. this is a professional mountain biking race in south africa. >> oh! >> what was that? >> holy cow! [ bleep ]. >> what you're seeing is a red hartibeest. average weight, 340 pounds, this thing can run up to 40 miles per hour, completely decking, decking this mountain biker. >> oh! >> what? >> the guy who gets crushed is echb. the guy behind him is travis walker. his teammate. they're both professional m