Can You Make It Through This Entire Vertigo-Inducing Mountain Biking Video? 45.39K Adrian Chen 12/22/11 12:52PM Filed to: Insane Insane Sports Mountain Biking Video Tweetg Fb Mountain biking down a track barely as wide as your tire on the side of a towering cliff is "fun" to some people. It looks more like an elaborate failed suicide attempt to me. Watch it full-screen for extra nausea. [via Kottke]