Freestyle Walking 
I'm into extreme sports as much as the next guy, but there have been some new ones introduced to me in the last couple of days (see extreme unicylcing). Today, I had the pleasure of discovering Extreme Walking. Yeah, it sounds lame, I mean how hard is it to put one foot in front of the other? But these kids take it to the next level. They jump over sick roof gaps, backflip off ledges, and generally throw personal safety out the window in an effort to make walking as dangerous as it can be. I think they've succeeded. Enjoy.