Now that you mention jumping off something:
I was on the second story of an apartment, on the patio, and we tried to jump off th balcony on to a trampoline.
I hit the trampoline and bottomed out on the ground, sprained both ankles, and then continued my forward trajectory off the trampoline and on to the groundl landing me a pretty big knot and a bloody face. The ER loved me when I was younger...
Ray