Pierino contro tutti

Rome: Peter (Pierino) is a precocious but mischievous boy who often plays pranks and makes jokes at school. His enemy is his old teacher. One day Pierino pulls a dirty trick on her, making her break an arm. The substitute class teacher is a pretty girl Pierino falls in love with. However, a professor also falls in love with the beautiful teacher, and so Pierino must devise numerous jokes to save the teacher.