5. Francis Ford Coppola
Francis Ford Coppola has always done things his way - he turned his back on extremely lucrative screenwriting jobs in order to fulfil his artistic inhibitions and make a movie. Coppola prefers to shoot on location rather than in a studio, which is most notable in Apocalypse Now, his haunting war masterpiece. He rather impulsively decided to cart his cast and crew off to a jungle in the middle of nowhere and the result was years of chaos and production troubles. Battling against extreme weather, a temperamental Marlon Brando and an increasingly tough shoot, Coppola slowly but surely went a tiny bit insane. The documentary, Heart of Darkness, directed by Coppola's wife, Eleanor, captures the on-set madness perfectly. Harvey Keitel was sacked from the production merely days after he joined, Martin Sheen had a heart-attack, Brando was grossly overweight, multi-million dollar sets had been destroyed by the weather and they had been filming and editing for years upon years - it takes an unquestionably crazy man to live through it all.