As the authors of Rounders, Knockaround Guys, and Ocean's Thirteen, David Levien and Brian Koppelman are known for writing about characters who are great con artists, but Solitary Man marks the first time one of them is basically conning himself. In their new film, which Koppelman wrote and they directed together, Michael Douglas plays the king of all snake-oil salesman, a used car magnate who becomes a shameless, self-destructive lothario after a doctor's visit hints at the possibility he might be dying.