I broke my left arm after falling off of monkey-bars when I was like 9ish. Cracked my funny bone right near the elbow, so I had to wear a cast for about 6 weeks. Fucking everyone at primary school wanted to sign my cast for some reason. Scored 2 TDs playing football while wearing it (the only 2 TDs I remember scoring, go figure). Also fell off the edge of a small pillar at a shopping center and bruised my knee to the point where I had to use crutches when I was maybe 10-11. If it counts as an "injury" I had to get surgery for appendicitis at one point and had trouble walking for a week coz it fucking hurt.
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I stood on a Lego once. ...Seriously though, I broke my right arm when I fell on my left, only to find out I had a Cyst sitting in my right arm :P