London-based prankster and magician Julius Dein took to the street to gently humiliate random people with a simple yet very effective prank. With a little mind manipulation, Dein got Londoners to repeatedly yell "I am a penis!!" in a way that's guaranteed to make your inner school-child giggle. Sure, roll your eyes and say it is immature, but don't act like you're not going to try this on your friends and family later.