Heh. There was a long piece of plastic we had used as a 100-foot slide, putting it down a hill. Part of that hill was flat, and when I went down, it stopped me. So, I stood up, as any smart 8th grader does. A 10th-grade football player JUST SO HAPPENED to come barreling down the slide at that moment, sending my head directly into the ground. Grass has never felt so hard. That was my 3rd concussion.