Sam loves The Beatles, French pancakes from IHOP, and reading Dr. Seuss' "Green Eggs and Ham" out loud to his little girl. As Sam, Sean Penn speaks in tight, toneless clumps, punctuated by bursts of childlike glee. He claps his hands and pounds every available surface, drumming out a beat to a song only he can hear. He's strapped into his Starbucks apron, color-coordinating the sugar packets. He barks at customers, "That's an excellent choice," whether their ice-frappucino is tall or grande, and we wonder why the world is different for him.