6. BAD SANTA (2003)
Director: Terry Zwigoff
James Gunn says: Bad Santa has some great moments. The darkest of dark comedic moments is when Billy Bob Thornton picks up that child and starts punching him in the face, and we’re rooting for him! That’s insane. It’s one of the few movies on my list that was actually successful at the box office. A lot of people went to see it, despite the fact that it was so dark.