I thought I’d start this community off with a classic post:
What are your favourite lines from the books that were not in the movies?
I’ll go first: “Give her hell from us, Peeves.”
‘STOP THEM!’ shrieked Umbridge, but it was too late. As the Inquisitorial Squad closed in, Fred and George kicked off from the floor, shooting fifteen feet into the air, the iron peg swinging dangerously below. Fred looked across the hall at the poltergeist bobbing on his level above the crowd.
‘Give her hell from us, Peeves.’
And Peeves, who Harry had never seen take an order from a student before, swept his belled hat from his head and sprang to a salute as Fred and George wheeled about to tumultuous applause from the students below and sped out of the open front doors into the glorious sunset.
In the same vein; “It unscrews the other way,” McGonagall to Peeves
From The Half Blood Prince: “Snape!” ejaculated Slughorn, who looked the most shaken, pale and sweating. “Snape! I taught him! I thought I knew him!”