I jumped off a 9 foot wall a month or two ago. It wasn't a smart idea, seeing as how I didn't know how to land very well.
I didn't absorb the fall by bending my legs as much as I should have. Instead of landing in a crouched position with my hands on the ground, I landed halfway up from it.
Well, I bruised my right foot, near the area below the base of the big toe's bone. Couldn't walk on it, for a while. :(