BASE jumping is a sport where the jumper just flings him from BASE (Buildings, Antennas, Spans or Earth) with nothing other than a hand-deployed parachute for the purpose of preventing ‘deceleration trauma.’ In a sport like this, there is no telling what the jumper might slam into and what kind of injuries he may sustain. Given the extreme nature of it, it's easy to see why BASE jumping is one of the most dangerous sports you can do.