As Harris, the bewitched, bothered and bewildered movie star trousering $2 million for a whisky commercial, Murray distils many of his best characters from Groundhog Day to Rushmore. Savage, funny and effortlessly sexy, he is utterly convincing. Johansson is no less luminous, encapsulating with unforced economy the disappointment of the recently wedded and abandoned young wife who diverts her thwarted hopes towards an older man.