Don't let the title fool you. This is not a jolly father and son comedy. It's actually a complex and compelling drama about the making of the first atomic bomb. Paul Newman, John Cusack and Natasha Richardson are integral players in this ensemble cast who help tell the story of the Manhattan Project – a codename for the top-secret research and development of the original nukes. "Fat Man" and "Little Boy" were the nicknames of the atom bombs dropped on Japan during World War II, and if you thought they caused a ruckus upon impact, wait til you witness the battles between the scientists and military men, whose egos were at war behind the scenes. This drama doesn't take sides, and if you're not familiar with the history of the A-bomb, this is a great place to start.