The Valparaiso Cerro Abajo is the most insane downhill bicycle race in the world. The guys who ride the course might be the craziest bros on earth… and some of the most skilled. Watch as 2011 winner Filip Polc narrowly avoids beheading a poor street dog with his foot-powered tire saw at the 28-second mark. Things only get more impressive from there as he navigates the oil and piss stained stairs and alleyways of the dizzying Chilean mountainside track. And you thought your weekend bike ride was helmet cam video worthy.