When Gryfindor and Slytherin play Quidditch, keep a keen eye on the second goal they score, the gryfindor scorer is the same person as the Slytherin keeper. This is wierd. But if you look closely and think about it then they are the same person. Also there are two people on the same team, cant remember which one it is, that are the same person, you need to look closely as i cant remember when it is.