The United Nations General Assembly convened in Manhattan this week, and everyone came! Libyan leader Muammar Gaddafi wowed the crowd with a suggestion that the United Nations Security Council be renamed the “Terror Council,” while Iranian President Mahmoud Ahmadinejad caused a walk-out by many delegations. John Hockenberry looks at the purpose of this global forum for world leaders in the 21st century. Is it reasonable to expect gravitas from the U.N., or is it just a just a way to bring together “the greatest show on earth?”