Divorzio all'italiana (1961)

Since the Roman Catholic Church forbids divorce, the only way to get out of a marriage is the either the unfaithfulness or death of one's spouse. When Ferdinando falls in love with his nubile cousin, he devises a ploy to get out of his marriage.

The film is quite clever in its portrayal of the very inept Ferdinando and we are completely flabbergasted that his cousin falls for him and at the grossly inept Italian justice system. But we laugh a lot thanks to ingenious acting.

IMDB