Four friends - James, Tim, J.J. and Mike - take advantage of a hot day in Melbourne, Australia, by playing a game of a water bomb fight. Whilst the boys are playing, James's sister gets an unwelcome splash from her brother. The water fight is ended shortly because of the change of weather - it rains. James and his friends agree that they've had the best water fight ever. James's sister gets revenge by soaking the four friends with a hose.