We were playing Hufflepuff and the Beaters smacked me with both bludgers. They didn't realize it, so it wasn't malicious or anything, but my arm broke something awful, I got knocked out, and I fell from my broom. I was healed up pretty decently, but I never got the full range of motion in my left arm again and since I'm left-handed and used that arm to catch and throw quaffles, I wasn't as good as I had been.