THRILL HILL

Oh, man! We'd never heard about this terrifying bike race until a friend sent it our way and blew our minds. This downhill challenge makes other extreme sports look like strolls in the park. This course--if you can call this obstacle-strewn nightmare a "course"--is absolutely deadly, and the head-cam offers a glimpse of the adrenaline-addled rider's viewpoint as he races toward nearly certain oblivion. In case your brain has been replaced by a candied apple, we should warn you to avoid attempting this in your own backyard. In other words, don't be a suicidal jackass.

The original posting offered this by way of explanation:

"I have seen insanity and it happens on the streets of Valparaiso, Chile. The Valparaiso Cerro Abajo Race is a legendary urban bike race and is more extreme than skydiving. The rider must brave jumps, stray dogs, and flights of stairs along the steep downhill path. The first person perspective provided by the excellent helmet cam lets us take in every glorious and frightening detail."