Pierino contro tutti (also known as Desirable Teacher) is a 1981 comedy film directed by Marino Girolami. The main character of the film is Pierino, an Italian variation of Little Johnny. The film was a massive success at the Italian box office, and generated a brief series of sequels (in the main part non-official sequels) including a female version of Pierino, as well as a short lived subgenre of joke-films in which the plot basically consists in a series of jokes placed side by side.
Rome: Peter (Pierino) is a grew restless and joker boy, who combines jokes in his class at school. His enemy is the old teacher, who one day Pierino pulls a dirty trick, making she breaks her arm. The alternate teacher class is a pretty girl, of which Pierino falls in love. Even though a professor falls in love with beautiful teacher, and so Pierino must devise numerous jokes to save the teacher.