Madeline

“Hello, Harry" said George, beaming at him. "We thought we heard your dulcet tones."
"You don't want to bottle up your anger like that, Harry, let it all out," said Fred, also beaming. "There might be a couple of people fifty miles away who didn't hear you.”
― J.K. Rowling, Harry Potter and the Order of the Phoenix

“Don’t put your wand there, boy!” roared Moody. “What if it ignited? Better wizards than you have lost buttocks, you know!” “Who d’you know who’s lost a buttock?” the violet-haired woman asked Mad-Eye interestedly. “Never you mind, you just keep your wand out of your back pocket!” growled Mad-Eye. “Elementary wand safety, nobody bothers about it anymore . . .” He stumped off toward the kitchen. “And I saw that,” he added irritably, as the woman rolled her eyes at the ceiling.”
― J.K. Rowling, Harry Potter and the Order of the Phoenix

“Draco Dormiens Nunquam Titillandus

[never tickle a sleeping dragon]”
― J.K. Rowling, Harry Potter and the Sorcerer's Stone

“Understanding is the first step to acceptance, and only with acceptance can there be recovery.”
― J.K. Rowling, Harry Potter and the Goblet of Fire