 DATE: When Dr. Yen Lo makes his little "yak dung" joke he parodies  the famous advertising jingle "(Winston) tastes good like a  cigarette should". Unfortunately the cigarette and its advertising  slogan werent introduced until 1954, a year after the end of the  Korean War, so Yen Lo couldnt have made the joke. The joke was  originally part of Dr. Yen Los speech in the original novel by  Richard Condon, then retained in the movie script. It was amusing  for both the 1959 and 1963 audiences for whom the Winston jingle was  ubiquitous.