A while back (before the server crash, I think) somebody posted in one of the head canon threads their idea that Scout had polio as a child and loves to run so much now because the polio isn't holding him back anymore. (I think it was something along those lines). Anyway, I just remembered it the other day, and the more I think about it the more it intrigues me. So yeah, I'd love to see a story using this concept.