Daniel Radcliffe has lots of reasons to be in a happy mood: The final Harry Potter movie broke international box office records in its first weekend of release, and Radcliffe’s Broadway show, How to Succeed in Business Without Really Trying, is grossing more than $1 million a week. The charming actor dropped by The Daily Show with Jon Stewart on July 18 to talk about his busy schedule and answer a few (hilarious) questions from young fans outfitted for a game of Quidditch. Find out how Spongebob Squarepants helped Radcliffe prep for his role in Equus, how he feels about the end of the Potter phenomenon and more.