"To have dragons one must have change; that is the first principle of dragon lore."

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Well, I certainly don't," said Percy sanctimoniously. "I shudder to think what the state of my in-tray would be if I was away from work for five days." "Yeah, someone might slip dragon dung in it again, eh, Perce?" said Fred. "That was a sample of fertilizer from Norway!" said Percy, going very red in the face. "It was nothing personal!" "It was," Fred whispered to Harry as they got up from the table. "We sent it.

— J. K. Rowling