'Franco e Ciccio... Ladro e Guardia' (1969)

A cop has a cousin who is a thief, and one day while he is chasing him he ends up in a room with a murdered man. The two are photographed at the murder scene and believed to be the assassins. The police however believe in their innocence and send the odd couple on the trail of the real murderer who is thought to be working in a circus.