Football isn't as cut-and-dried as baseball, so the position doesn't change. It's not like Bush or Westbrook will ever get WR eligiblity or something. In my memory the only ones recently were colston and robinson (this year), cooley (last year), and kordell stewart.
It's probably better that way. And to have multimpositional eligiblity in baseball doesn;t affect the game as much as it would in football, since football is just total points, whereas baseball is roto. So werid eligibilities are cool, but they can also affect your stat dispersement.
The opening scene of the movie "Saving Private Ryan" is loosely based on games of dodgeball Brian Dawkins played in second grade.