"When did the famous duel between Gellert Grindelwald and Albus Dumbledore take place?!" Sirius held the book behind himself, jumping backwards to stay out of Remus' reach. It really was too easy, but somehow that didn't keep him from being entertained by it. "Come on, tell me. I'm giving you a quiz. I got an Exceeding in History, so, you know."

To be fair, the worst grade he had, tied with Muggle Studies and Astronomy, because some thing were just hard to care about, but that still meant he was doing all right. Good enough for a stunt like this, anyway.