Knotts went on to star in a series of film comedies that drew on his high-strung persona from the television series: he had a cameo appearance in United Artists' "It's a Mad, Mad, Mad, Mad World" (1963), and starred in Warner Bros.' "The Incredible Mr. Limpet" (1964). Knotts then began his Universal five-film contract with "The Ghost and Mr. Chicken" (1966), "The Reluctant Astronaut" (1967), "The Shakiest Gun in the West" (1968), "The Love God?" (1969) and "How to Frame a Figg" (1971). Knotts reprised his role as Barney Fife several times in the 1960s: he made five guest appearances on "The Andy Griffith Show" (gaining him another two Emmy Awards), and he later appeared once on the spin-off "Mayberry R.F.D.", where he was present as best man for the marriage of Andy Taylor and his longtime love, Helen Crump.