The comedic genius of Eddie Murphy was applauded Sunday by a virtual parade of entertainers during the Kennedy Center?s 18th annual Mark Twain Prize. Murphy opened his first stand-up set in 28 years with an impression of Bill Cosby, whom he refused to play on ?Saturday Night Live?s? 40th anniversary show. While accepting the honor, Murphy discussed the award, which Cosby won in 2009. The actor and comedian said, "Bill has one of these. Did you all make Bill give his back? You know you messed up when they want you to give your trophies back.?