Appearances and Cameos
Williams and Billy Crystal were in an unscripted cameo at the beginning of an episode of the third season of Friends. His many TV appearances included an episode of Whose Line Is It Anyway?, and he starred in an episode of Law & Order: Special Victims Unit. In 2010, he appeared in a sketch with Robert De Niro on Saturday Night Live, and in 2012, guest-starred as himself in two FX series, Louie and Wilfred. In May 2013, CBS started a new series, The Crazy Ones, starring Williams, but the show was canceled after one season.