I was just talking to my little sister about Fred and George, and she suggested one of the wierdest theories I have ever heard, I doubt anyone will take it seriously but it's entertaining so I thought I'd share it with you. I told her my idea about Fred and George time travelling and she suggested that by using the time turner they might actually be the same person. Although it is a strange idea it'd explain a lot about them, e.g. they do no work but get reasonably good marks because they have technically heard everything twice.