'Leaves of Grass' is a quirky and sometimes bizarre little festival movie that just so happens to have a laundry list of big Hollywood names in it, including Edward Norton, Susan Sarandon, Richard Dreyfuss and Keri Russell. The reason? Writer, director and actor Tim Blake Nelson.

At SXSW, Moviefone sat down with Nelson (best known for his role in 'O Brother, Where Art Thou?') and his 'Leaves of Grass' star Norton, who plays both an Ivy League professor and his small-town Oklahoma pot-growing twin brother. So where did the idea for the movie come from? According to Norton, it's all in his director's "deeply schizophrenic mind."