Harry Potter and the Sorcerer's Stone - Pg 214

  "Sir--Professor Dumbledore? Can I ask you something?"  "Obviously, you've just done so," Dumbledore smiled. "You may ask me one more thing, however."  "What do you see when you look in the mirror?"  "I? I see myself holding a pair of thick, woolen socks."  Harry stared.  "One can never have enough socks," said Dumbledore. "Another Christmas has come and gone and I didn't get a single pair. People will insist on giving me books.