Yup. Testing new tires and brake adjustments on wet grass on a mountain bike. I thought the tires would skid a bit since they were chevron tread rather than knobbies. Nope. They dug in hard. And it was my first bike with linear pull V-brakes. I really underestimated how hard those brake with only fingertip effort.

Went over the bars and landed on my feet like a gymnast. For a split second I was ready to do the victorious arms raised thing. Then I tangled a foot in the brake cable and fell splat on the ground anyway. Minus 2 points from the judges.