Il Magnifico cornuto (The Magnificent Cuckold). 1964. Italy. Directed by Antonio Pietrangeli. In Italian; English subtitles. 117 min.
Screenplay by Diego Fabbri, Ruggero Maccari, Ettore Scola, Stefano Strucchi. With Claudia Cardinale, Ugo Tognazzi, Bernard Blier, Michèle Girardon, Gian Maria Volonte. A happily married businessman (Ugo Tognazzi) allows himself to be seduced by the wife of a colleague—a meaningless affair that makes him realize how easy it would be for his young and beautiful wife (Claudia Cardinale) to betray him as he betrayed her. His unfounded suspicions grow into madness, as he obsessively imagines her in the arms of other men. Adapted from a 1921 farce by the Belgian playwright Fernand Crommelynck.