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“What have you been doing to that book, you depraved boy?' 'It isn't the library's, it's mine!' said Harry hastily, snatching his copy of Advanced Potion-Making off the table as she lunged at it with a clawlike hand. 'Despoiled!' she hissed. 'Desecrated! Befouled!' 'It's just a book that's been written in!' said Harry, tugging it out of her grip. She looked as though she might have a seizure; Hermione, who had hastily packed her things, grabbed Harry by the arm and frogmarched him away. 'She'll ban you from the library if you're not careful. Why did you have to bring that stupid book?' 'It's not my fault she's barking mad, Hermione. Or d'you think she overheard you being rude about Filch? I've always thought there might be something going on between them ...” — J.K. Rowling