A Dangerous Toy

A Dangerous Toy originally titled Il giocattolo is a 1979 Italian crime drama film written and directed by Giuliano Montaldo. It was coproduced by Sergio Leone. The toy of the title is a gun. The movie chronicles how a frustrated and shy accountant may become a cruel and ruthless executioner. For his role in this film Vittorio Mezzogiorno won the Silver Ribbon for Best Supporting Actor.

Source: Wikipedia