This movie is just downright hilarious, so fear not, if you're looking for a decent movie to watch of a Friday night in, 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.