Joseph Gordon-Levitt appeared on The Tonight Show with Jay Leno last night to promote his new movie, 50/50. There wasn’t a lot of The Dark Knight Rises talk, but Leno did bring up Batman. Gordon-Levitt explained that he’s always been a huge Batman fan, even before Christoper Nolan’s movies. He talked a bit about his character, John Blake, and again declined to comment when Leno asked about the Robin rumors. Gordon-Levitt also said that Heath Ledger’s Joker is his favorite Batman villain. Check out the brief Batman talk around the 1:13 mark of the video.