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Stand-up comedian and writer Jena Friedman returns to The Late Show to tell Stephen what inspired the title of her new book, \u201cNot Funny,\u201d and explain why she abandoned a plan to get someone named Bill Cosby to write the forward. \u201cNot Funny\u201d is available everywhere now.\nLearn more about your ad choices. Visit megaphone.fm/adchoices