What's the dumbest thing you've ever done?

i'm sure I have lots... most from childhood... cut my nails with scissors, pretended that some styrofoam panels i found in my neighbor's yard was lightning and smashed it to bits over my head (yeahh.. your guess is as good as mine) colored my hair with markers, ate anything that said "non-toxic" (glue, crayons, etc.), some that i did with friends- tried to make a gas station by collecting gas that leaked out of cars and putting it in waterguns for the pumps, danced on the roof of the neighbor's garage, made a "stew" in a bucket of garbage, mud, diapers and other disgusting things we found, gave the class hamster a bath, and yours reminded me of when i fell out of a tree and blacked out for a minute or two, and when i was in elementary and tried to sit on the monkeybars with this boy i liked and fell backwards and hit my head on a bar, but tried to play it cool, lol. i had a concussion but went on the rest of the school day like nothing happened, kept falling asleep in class and my mom only found out later that night when i threw up... and one time i wanted to get a different view while riding my bike so i rested my chin on the handle bars and pedaled really fast, hit some bumps and must've chipped my teeth because i felt a lot of little pieces.. although not much visible damage..ahh good times