I'd like to go again, if no one minds.
1. When I played college football, I once took an (inadvertent) helmet-to-helmet hit that left me bleeding from my jaw. I got right up, trotted off the field, was sent to the locker-room, saw the blood, and promptly passed out. I still have a scar.
2. In high school guitar class, my teacher once brought in a professional musician (drummer) for the sole purpose of her, the drummer, and myself performing together during the lunch period as part of the weekly guitar class lunchtime concert. I was the only person who the teacher and the drummer performed with, ever, at the school.
3. In order to disguise myself when sending an anonymous Valentine's Day card-and-rose in middle school, I wrote the card using absolutely perfect cursive, instead of my ridiculously-bad script. The girl still doesn't know I sent her the card, though we've been friends since sixth grade.
4. My fifth-grade teacher got all the fifth-grade classes together and basically played a live-action, year-long version of Sim City with us. I was City Manager (not the mayor, but basically the mayor's third-in-command), and often got so into it that I would get terrible headaches from skipping lunch to work on the project.