La chiave di casa(1956)

On his way home, Don Simone meets his friend Ciccillo, who asks him for a favor: to entertain the husband of a woman, his lover, until they find the keys to her house. Simone accepts the task and his friend points out a man sitting in a pizzeria as the lover's husband. After a series of mishaps, however, poor Simone discovers that the man had nothing to do with it and that the person Ciccillo wanted to entertain was actually him.