Landed on my hip during tumbling practice in karate. Hurt for about a week. Worst injury I had in there. I always thought it was funny that I had a hobby which actively involved full contact without sustaining serious injury for 6 years while the various school sports team members regularly broke bones, sprained muscles, received concussions, and pushed themselves to the point of exhaustion and vomiting. This is because for all the supposed theories of physical education and notions of sportsmanship, they never learned one simple thing I did in karate: restraint. My instructor once said he would rather spar a black belt than a white belt because a black belt knows his own power and how to limit it in practice, while the white belt can seriously hurt someone without intending to.