I can't think of a clear winner, but I remember figuring out how a broken bone feels. When I was in third grade, my pal and I were jumping off of the swings during recess. I would always just pull in my hands before jumping, however, I noticed that my buddy reversed his grip on the last swing before the jump. I tried his technique, and on the last back swing, the seat slipped up from under me, and I sailed back and face down onto the asphalt. My wrist hurt terribly, but I went back to class. After about 20 minutes, I started to feel nauseous and had to excuse myself. It was broken. The next year, I fell off of the jungle gym and landed hard on the same arm. I got up, told my friends that I had just broken my arm, and walked to the principal's office. I was right.

Just before the put on my cast, the doctor had to drain the blood that had pooled in my broken elbow. I distinctly remember that pain, which was far worse than the break itself. Injuries can hurt bad, but nothing hurts more than fucking with an injury after there's been some time for the nerves to get sensitized. Come to think of it, I also distinctly recall getting a tetanus shot into the wound of a cut finger. Instant sweats.