In high school, my friend got a new (to her) Camaro with a scoop on the hood. We ditched school one day and took the car out for a spin. We ended up at the lake and I decided to ride on the hood of her car.
She had just waxed it. We were tooling along down a gravel road to the lake when she and my other friend decided it would be funny to scare me and hit the gas a bit. Welllllllllllll...........Instead of hitting the gas she accidentally hit the brakes instead and I went sailing off the car onto the gravel road.
I landed knee first and crushed my kneecap.
Fast forward to the emergency room when my mother came in and we told her I did it playing volleyball in PE. She believed it until the day she died!