So, I played humans vs zombies in college, and in my first game I sprinted after a guy and tripped on stone-studded concrete ground. Both hips got enormous scrapes. On the bright side, the guy I was chasing dropped his water bottle and stopped to pick it up, so I actually got up and caught him anyway.

Overall not a significant injury, but I was unable to run with the bandages for the rest of the game and I still have scars on my hips.

Or I guess there's the bike rock: I was intending to ride up the curb with my bicycle and took it WAY too shallow, lost control, and slammed shoulder-first into a jagged rock wall. Dunno how I didn't break anything or require stitches, but I did get a lightning bolt scar on my elbow. The dangerous part was actually after that; I was lying on the sidewalk for a while thinking "that was dumb and I knew it was going to happen" when a car decided to pull over to help me up, and one of its tires pinched a baseball sized rock that went flying a foot to the side of my head with a loud crack against the wall. While the help was nice, the rock kinda spooked me.