A little Monday morning casting scoop! Although the news has yet to be confirmed by the network, The TV Fanatic has heard that Tim Conway, best known for making himself and the rest of the cast break out into spontaneous laughter while starring on The Carol Burnett Show, will make a guest appearance on upcoming episodes of 30 Rock. The legendary funnyman plays a plays a famous actor from TV’s heyday 50 years ago. If Tim can get Rock star Alec Baldwin to crack a smile, then he is a comic genius! The Emmy award-winning show returns to NBC April 10.