You Must Be Joking! is a 1986 South African film. It is Leon Schuster's first hidden camera film.
Plot
In a series of short skits, Leon Schuster uses candid camera and several disguises to stitch up the general public of South Africa. Such sketches include: The watermelon pulse test, where Leon shows that a watermelon is only ripe when it does not have a heartbeat, much to the confusion of the seller. Cooking on the bonnet of a car, while upsetting the traffic police. Supposedly killing a cow in a butcher's shop.