You couldn't ask for a better match-up than Von Trier, a world-class filmmaker with an infamous sadistic streak, and the depressive Leth, truly a melancholy Dane and a talented artist in his own right. As we follow Leth's efforts to revisit an old film in different formats under various hardships — one obstruction is to film in a place that terrifies him, another to create an animated version of his artsy short — we learn the man's mindset and prodigious store of artistic resources, via his wry voiceover. In the end, however, Von Trier unintentionally reveals as much about himself as his cunning subject, a great twist on a wicked psychological game.