Climbing trees (fall risk)
Climbing tall playground equipment (I broke my arm falling from a height of just 3 feet once, on one of those). Broken neck, etc.
Playing in the street (cars)
Bicycling (can get hit by a car, sigh)
Trampoline (don't get me started)
Exploring (falling down deep wells, etc.)
The Gashlycrumb Tinies is not just a morbid story about impossible deaths. Living is dangerous, living young possibly especially so!