Explaining a Movie on Instagram: "In the behind-the-scenes footage from Tropic Thunder (2008), Robert Downey Jr. can be seen maintaining Kirk Lazarus between takes, keeping the voice and posture even when the cameras are not actively rolling. What makes that especially funny is how it deepens the film’s central joke. Kirk Lazarus is itself a parody of extreme commitment, an actor performing seriousness to the point of absurdity. Watching Downey linger in that persona off-camera adds an extra, un