Whether she was trying to or not, Emma Watson trolled everyone watching The Late Show with David Letterman just before the premiere of Harry Potter and the Deathly Hallows Part 2. Since then, the still shot of just the right moment has become infamous across the internet. How did you get your jaw that shape, Hermione? We all know that the Trollvada Kedarva spell is the fourth Forbidden Curse. Surely you didn't dive into the Dark Arts for a successful troll, did you?