Stephen Colbert, host of CBS's "The Late Show With Stephen Colbert," talks with moderator Ben Schwartz to celebrate his show. Topics include: why Colbert thinks of his career as "a series of happy accidents"; the way his approach to comedy has changed over the decades; his early goal to become a dramatic actor; how he developed his character on "The Colbert Report"; the reason he hesitated to become "The Late Show's" host; his relationship with "Late Show" predecessor David Letterman; the unique method used to test out comedy material; his "enjoyment" when dealing with guests that are "uncomfortable" on set; not sticking to pre-planned topics with celebrities; and why "famously difficult" guest Robert De Niro became his favorite interview of all time.