Grape-Nuts is a brand of breakfast cereal made from flour, salt and dried yeast, developed in 1897 by C. W. Post, a former patient and later competitor of the 19th-century breakfast food innovator Dr. John Harvey Kellogg. Post's original product was baked as a rigid sheet, then broken into pieces and run through a coffee grinder. Marketing Grape-Nuts was initially marketed as a natural cereal that could enhance health and vitality, and as a "food for brain and nerve centres." Its lightweight and compact nature, nutritional value, and resistance to spoilage made it a popular food for exploration and expedition groups in the 1920s and 1930s. In World War II, Grape-Nuts was a component of the lightweight jungle ration used by some U.S. and Allied Forces in wartime operations before 1944. A 1939 ad campaign by cartoonist Walter Hoban continued his Jerry on the Job comic strip in Woman's Day magazine and daily newspaper comics pages. General Foods also marketed Grape-Nuts through a comics-style advertising campaign (a trailblazer in this regard) featuring a character named Little Alby, who gained inordinate strength after consuming a bowl of Grape-Nuts. During the 1940s, comic books from various companies featured one-page comic-strip ads starring Volto from Mars, a finned red helmet-clad alien superhero visiting Earth, who, like all Martians, recharged his magnetic powers (his left hand repels, his right attracts) by eating "cereal grains", with him quickly developing a particular fondness for Grape-Nuts Flakes which he proclaimed "the best I ever tasted!" In the 1960s, advertising promoted Grape-Nuts as the cereal that "fills you up, not out". Brand users, particularly mother/daughter look-alikes, were shown engaged in fitness activities such as tennis, horseback riding, skiing, and swimming. Also appearing during the "fills you up, not out" campaign were Rob Steffens and Peter Steffens as the characters from The Peter and Bobert Show, as well as Andy Griffith and Don Knotts as Sheriff Andy Taylor and Deputy Barney Fife. This ad campaign produced one television commercial, which aired on television in 1968, that featured a catchphrase that became a target for numerous sketches and satirical mentions in media. Spanning the ensuing two decades and beyond, "Oh no, Mrs. Burke! I thought you were Dale!" was parodied on television variety show sketches, in the film The Kentucky Fried Movie, and in many episodes of Mystery Science Theater 3000. Fans continue to discuss the origin of this "riff"