18x175 - Late Show with David Letterman

Dave welcomes actor Robert Downey Jr. and actress Rooney Mara. Top Ten Mahmoud Ahmadinejad Demands For Returning Our Drone. From alpacas to kitties, Robert runs down the list of animals on his family farm. Rooney talks about how hard it was to shake her "Girl with the Dragon Tattoo" character. The "Girl With The Dragon Tattoo" star gets wasted to get the role.