That reminds me of something slightly similar I saw on America's Funniest Home Videos. 2 kids were in their backyard, where it was kinda wet and muddy. One boy was on a dirt bike (the motorized kind), and the other was holding onto the bike just above the read tire. The first boy would ride around slowly, pulling the other boy who would slide around water-ski style behind him. Got the idea? Well, the second boy's feet started sliding out in front of him. Instinctively trying not to fall, he held on to the bike, but his feet kept getting farther ahead of him until his groin got caught between the top of the rear tire and the bike frame, complete with a small cloud of white smoke.