How many movies have Bob Hope and Phyllis Diller acted in together?

They have worked on 6 movies together! Their first movie together was Boy, Did I Get a Wrong Number! (1966) while their highest rated movie together was The Private Navy of Sgt. O'Farrell (1968). They have not worked together since The Best of the Dean Martin Celebrity Roasts (1998). They are most known for their comedy films together.