Take a video thrill ride as a guy with a helmet cam books it down a river of ice! He never would have gotten started if it weren't topped with snow, but we eventually see crystal clear ice. Every inch of this course is slick, and we go zipping up and down the river with him at terrifying speeds. We don't know where this is, but the language is Russian, so it's likely pretty darn cold. Toward the end, he gets a little crazy spinning around -maybe just trying to stop, but more likely he's showing off. Whee! -via Kottke