Polyjuice Potion
A SERIOUS deal has been made out of the Polyjuice potion. i dont suppose theres any chance that one of the characters we have grown to know through the series is gonna turn out to be completely different? or maybe Snapes been using the polyjuice potion to get to the deatheaters? (remember, in book 4, voldie says that one of his deatheaters is 'lost to him forever' - presumably snape)