How to Lose a Wife and Find a Lover (1978)
Castelli is an advertising executive who, having returned home early due to a car accident with Eleonora Rubens, a young Dutch woman abandoned by her husband, surprises his American wife in intimacy with the plumber
How to Kill 400 Duponts (1967)
Dorellik, an Italian contract killer that lives on the French Riviera, accepts a job to kill everyone with the surname Dupont that lives in France for a rich customer which supposedly would allow him to obtain a large inheritance