See Ben Stiller, Robert Downey Jnr, Jack Black, Tom Cruise and a whole ensemble of amazing actors in Tropic Thunder! 

Pampered action superstar Tugg Speedman is cast in the biggest, most expensive war movie ever produced. He sets out to Southeast Asia with a "Who's Who" of celebrity co-stars. They include Kirk Lazarus, an intense, three-time Oscar-winner; Jeff Portnoy, star of the popular gross-out comedy franchise "The Fatties"; multi-platinum hip-hop-star-turned-entrepreneur-turned-actor Alpa Chino; and first-timer Kevin Sandusky. Soon after the production begins the actors are thrown into a real-life situation and are forced to become the fighting unit they're portraying, in order to find a way out of the jungle in one piece.