You Must Be Joking! is a 1965 black and white British comedy film directed by Michael Winner and starring Michael Callan, Lionel Jeffries, and Denholm Elliott. It was written by Alan Hackney, from a story by Winner.

The format of the film, four people each doing six tasks linked to a scavenger hunt, allows for 24 otherwise somewhat unconnected comedy vignettes, which jointly create the story line. The items (purportedly representing British identity) include flying ducks for the wall, an English rose, the Spirit of Ecstasy from a Rolls-Royce car, an electric hare from a greyhound race and the Lutine Bell.