What was the dumbest way you ever injured yourself?

11, had just learned to ski, and so had my 8 year old brother. Except he hadn't really learned to brake yet so just went full speed downhill. As a good older brother I thought I should teach him and skid up next to him, reminding him to put his skiis in a V shape to brake. Unfortunately I was too close to him and our skiis got entangled, resulting in us traveling for a good 10-20 meters as a violent ball of skiis and limbs going whichever direction.

My kid brother was luckily fine, but I twisted my thumb bad enough to puke, freaking out the rest of the kids we were with. Didnt get to skii much more that trip.