The exact number of BASE-related fatalities is unknown, but estimates put the number above 200, with wingsuit malfunctions as one of the primary causes of death.
Amongst the many perils of non-motorized human flight: failure to deploy parachute, cord break, power line entanglement, drowning, and proximity flying (the shooting of narrow cliff gaps that makes for incredible GoPro footage, and has contributed to as many as five deaths by wingsuit).
Those seeking their own R. Kelly moment (I can fly!) should first consult the fatality statistics of Blinc Magazine, an online BASE jumping resource. Because while floating free fall is undoubtedly an unnerving endeavor, so is reading about all the ways it can end—badly.