Aldo has a bad habit of always acting like a straight guy. His friend Carletto, a serious guy who is in love with Giovanna, a silly girl who is attracted to men in uniform, doesn't like his lifestyle. Aldo is loved by Tosca, a fishmonger, but he despises her and prefers to court a beautiful greengrocer whose husband is extremely jealous. One cunning move after another, Aldo ends up getting himself into trouble...