“Give her hell from us, Peeves.”

“We won't be seeing you,' Fred told Professor Umbridge, swinging his leg over his broomstick.'Yeah, don't bother to keep in touch,' said George, mounting his own. Fred looked around at the assembled students, and at the silent, watchful crowd. 'If anyone fancies buying 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, 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.”

“Which way did they go, Peeves?" Filch was saying. "Quick, tell me." "Say 'please.'" "Don't mess with me, Peeves, now where did they go?" "Shan't say nothing if you don't say please," said Peeves in his annoying singsong voice. "All right- PLEASE." "NOTHING! Ha haaa! Told you I wouldn't say nothing if you didn't say please! Ha ha! Haaaaaa!" And they heard the sound of Peeves whooshing away and Filch cursing in rage.”

“Harry witnessed Professor McGonagall walking right past Peeves who was determinedly loosening a crystal chandelier and could have sworn he heard her tell the poltergeist out of the corner of her mouth, 'It unscrews the other way.”

“I wasn't paying attention," said Myrtle dramatically. "Peeves upset me so much I came in here and tried to kill myself. Then, of course, I remembered that I'm -- that I'm --" "Already dead," said Ron hopefully. Myrtle gave a tragic sob, rose up in the air, turned over, and dived headfirst into the toilet, splashing water all over them and vanishing from sight, although from the direction of her muffled sobs, she had come to rest somewhere in the U-bend.”

“I’d take that gum out of the keyhole if I were you, Peeves,” he said pleasantly. Peeves paid no attention to Professor Lupin’s words, except to blow a loud wet raspberry.Professor Lupin gave a small sigh and took out his wand.“This is a useful little spell,” he told the class over his shoulder. “Please watch closely.”He raised the wand to shoulder height, said, “Waddiwasi!” and pointed it at Peeves.With the force of a bullet, the wad of chewing gum shot out of the keyhole and straight down Peeves’s left nostril; he whirled upright and zoomed away, cursing.“Cool, sir!” said Dean Thomas in amazement.“Thank you, Dean,” said Professor Lupin, putting his wand away again. “Shall we proceed?”

“Hide them all, then. Keep her – them – safe. Please.'And what will you give me in return, Severus?'In – in return? Anything.”