Running on the treadmill, I watched Tropic Thunder as a HD rental on the Apple TV. This DreamWorks film is directed by Ben Stiller. It was written by Justin Theroux, Etan Cohen and Stiller.
Two random odds things about this movie.
First, Tom Crews appears in the film in heavy make-up. I did not even realize that it was Crews until very late in the film. To portray his character, Cruise used a fatsuit, fake large hands, and a bald cap.
Second, Robert Downey Jr.'s character is an Australian actor who has won five Oscars and has surgically dyed his skin to transform himself into a black man. The scene towards the end of the movie where Downey transforms himself from a black man back to an Australian actor in front of our eyes is fairly remarkable.