Downhill mountain biking is crazy in and of itself, but when you add an urban setting into the equation... it can only be described as EXTREMELY INSANE.  You can be sure that things get a little crazy when you downhill bike in Valparaiso, Chile.

It's called the Valparaiso Cerro Abajo Cup, and the race has been going on for over 10 years.  The race takes you zig zagging through the narrow streets of the city.  The course includes riding down stairs, along rooftops and through crowds of people.

Two words come to mind while watching some parts of this video... HOLY $%&#!!!