This one happened to a guy I used to work with. He came in on Monday, walking very carefully, and carrying a donut to sit on.
He had just gotten in line skates and had gone to the park to use them. He had adjusted quickly, and was moving at a very fast pace. As he was speeding along, he saw up ahead a light pole. Ooh, how cool! He decided to snag the light pole with his right arm, whip around 180 degrees, and speed off in the opposite direction. He would look so cool!
So he snagged the light pole with his right arm, and as he whipped around the pole, he realized that his feet were level with his head. How did his feet get up there? he asked himself just before he slammed his rear end into the pavement. Cracked his tail bone, and was out of commission for skating for a few weeks.