A poem I wrote about Filch's cat in Harry Potter. This poem was based on a fan theory I read that implied Mrs Norris was once a teacher at Hogwarts. She and Filch had supposedly had a love affair. Mrs Norris was then cursed into a cat by a Slitherin for associating with a squib. Ever since, Mrs Norris has prowled the hallways in order to aid Filch with disciplining students who even slightly misbehaved. Seems to explain Filch's attachment to the cat.