Got a belligerent bully on your back? Next time your paths cross, say "Every time I see a Dementor, I'm forced to relive our every encounter."Has that frenemy reared her ugly head? Tell her she's the fourth Unforgiveable Curse.Is a know-it-all giving you trouble? Arm yourself with "I can tell you didn't get an O.W.L. in Transfiguration. Otherwise you would've done something about your face."Whether you're a N.E.W.T.-level wizard or a wide-eyed witch still awaiting your Hogwarts acceptance letter, you've probably encountered a merciless Malfoy or despicable Dursley who makes your magical blood boil.