""Do you remember me telling you we are practicing nonverbal spells, Potter?" "Yes," said Harry stiffly. "Yes, sir." "There's no need to call me 'sir,' Professor.""
Book: Harry Potter And The Half Blood Prince Ooohh harry, you're going to be in so much trouble now! You can just imagine Snape's reaction at Harry's insolence, and while a roasting from the Potions Master might have been the thing of legends, there's a nagging suspicion that it might just have been a little bit enjoyable...
