This movie is just downright hilarious, so fear not, if you're looking for a decent movie to watch of a Sunday night, this won't fail to entertain. It features an all-star cast of comedy gold including Ben Stiller, Jack Black, Steve Coogan, as well as Oscar-nominated Robert Downey Jr, who plays a blinder in this. The movie begins with a director (Coogan) who plans to make a truly original war film by dropping a bunch of actors into the Vietnam jungle, with the intention of filming them fighting guerrilla-style. However, things quickly go wrong when they find themselves in an actual warfare situation, but they all still believe they are filming a movie. It's as funny as it sounds and for the love of God make sure not to miss an unrecognisable Tom Cruise with those now legendary dance moves.