I'm an unabashed fan of parkour (which I still prefer to call "free running" because it sounds less French). It's that rare phenomenon that's impressive as hell to watch because of the athleticism required and the inherent danger. Also, because it looks so cool, people who don't have the athleticism or grasp the danger love to attempt parkour stunts. And, thankfully, they make sure their friends film them trying it.
Like this guy, for example. For this clip, I have to turn to the wise words of YouTube commenter Shurikens16:
jajajajajajajajajaja dios no paro de reirme jajajajajaajaja se ha tirado y le ha dado en todos los huevos jajajajajajaja MUY BUENO EL VIDEO
Yes, muy bueno el video. Muy bueno el video, indeed.