American football? With all that padding and high tech helmets...dangerous? Pluease!
BASE jumping.... if you don't get slammed into the base, or have your chute get tangled... you could still slam into the ground.
The stats are hard to find but I've read that between 5 to 15 people get killed each year by BASE jumping... and that's not a very large field to begin with so I imagine that 5 - 15 is a fairly high percentage.
Perrine Bridge in Idaho is a popular BASE jumping site and I've lost track of how many have died there since I've moved to Idaho in 1994... more than several.