Scott’s life is in freefall: his girlfriend has just left him, he’s dropped out of studying medicine and he’s desperate for cash to help save his brother. Out of the blue his terminally ill neighbour ...

憨豆先生（罗温•艾金森 Rowan Atkinson 饰）总是傻人有傻福。他买彩票意外获得前往法国度假的机会。憨豆先生马上收拾好行囊，前往法国圆他的先锋派电影之梦！抵达巴黎后，憨豆先生遇到了一位来自俄罗斯的戛纳电影节评委。奇思妙想的憨豆希望能拍摄一部关于自己的先锋派电影，于是做事从来不顾后果的他带上了与那位俄罗斯评委走散的儿子，两人跳上了火车，路上扮演一对父子，却因语言不通大闹笑话，最后陷入了困境...