“If anyone fancies buing a Portable Swamp, as demonstrated upstairs, come to number ninety-three, Diagon Alley — Weasleys’ Wizard Wheezes,” he said in a loud voice. “Our new premises!”
“Special discounts to Hogwarts students who swear they’re going to use our products to get rid of this old bat,” added George, pointing at Professor Umbridge.
“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, whom 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.
Harry Potter and the Order of the Phoenix – J. K. Rowling