Director Todd Solondz is firming up the cast for his latest film, Dark Horse, and The Hollywood Reporter says Christopher Walken and Mia Farrow have come onboard to play parents to a thirtysomething loser who enlists a stunted Selma Blair to help him shed his rep as the “dark horse†of the family. Sounds like a perfectly unnerving group of actors for the Happiness helmer to work with, right? Not so fast, Solondz tells the Playlist: “It’s not designed to be controversial. There’s no rape, there’s no child molestation, there’s no masturbation, and then I thought ‘Oh my God, why didn’t I think of this years ago?’ Stories take on an unpredictable life.†[HR]