On "Serious Jibber-Jabber," Conan O'Brien has lengthy, uninterrupted conversations with interesting people on topics which fascinate him. In this special round table episode, "The Simpsons" scribes Al Jean, Mike Reiss, Jay Kogen, and Jeff Martin reunite with Conan for a rollicking 80-minute discussion about comedy, fatherhood, and the early days of the pioneering animated show.