"You see, Miss Granger isn't in fact, Miss Granger at all. No, in fact when I encountered her during her first year at Hogwarts, her sheer intelligence made me question her parentage. No muggle could be as magically gifted as she, it had to have been a mistake. So I had that Quirrel fellow look into it for me, and low and behold Miss Granger here was adopted," he paused as more murmuring erupted from the crowd.