FILE - In this March 19, 1978 black-and-white file photo, Carol Burnett shares a laugh with Tim Conway during taping of her final show , in Los Angeles. Burnett, who honed her humor on

 

              FILE - In this March 19, 1978 black-and-white file photo, Carol Burnett shares a laugh with Tim Conway during taping of her final show , in Los Angeles. Burnett, who honed her humor on
FILE - In this March 19, 1978 black-and-white file photo, Carol Burnett shares a laugh with Tim Conway during taping of her final show , in Los Angeles. Burnett, who honed her humor on Broadway and landed her own comedy show on television in 1967, will win the nation’s top humor prize. The Kennedy Center for the Performing Arts announced Tuesday that Burnett will receive the Mark Twain Prize for American Humor on Oct. 20 in Washington. A gala performance featuring top names in comedy will be taped and broadcast nationally Oct. 30 on PBS. (AP Photo/ George Brich, File)