The stars talk quick shoots, shots and fan power. With enough booze, thrills and pills to give your Nan a panic attack, Cherrybomb is a pulsing coming of age tale that doesn't pull its punches. Its stars, Robert Sheenan and Rupert Grint, talked us through the film's four week shoot, tell us what a cherrybomb is, and explain how their small army of fans mobilised to make it all happen.