What it Really all Boils Down to.
Unlike most people, Marvin doesn't have a little angel and devil living on his shoulders. Rather, he's got The Planet Lenny telling him filthy gossip about people he's never met; and then on the other side is Darin Millstrop, who yells convincingly at him about things that really aren't his fault. And if you think about it, that's all any of us really have. Because angels and devils aren't particularly real.