Uhm... Skateboarding, I popsicled. Basically, had a low to the ground p-rail, went for a bs boardslide, and... Well, my board was a LITTLE short, so my front foot missed the nose. Backfoot caught the tail, the rail acted as a pivot point, and shot the board straight up with... well, a significant amount of force.
For bonus points, I landed in the street, and my little brother had to direct traffic around me, all the while laughing his ass off. One of the neighbors stopped nearby and was like "He okay?"
Little brother responded with, "He's fine! Just racked himself!"
Seriously. OWCH.