(L-R) John Randolph, Diane Ladd, Chevy Chase, Beverly D'Angelo, E.G. Marshall and Doris Roberts in 'National Lampoon's Christmas Vacation.' Courtesy Everett Collection Share on Facebook Share on X Google Preferred Share to Flipboard Show additional share options Share on LinkedIn Share on Pinterest Share on Reddit Share on Tumblr Share on Whats App Send an Email Print the Article Post a Comment Picking a favorite line from National Lampoon's Christmas Vacation is nearly impossible, so let's just go with the one that struck me this year. Chevy Chase's long-suffering Clark W.