This movie, like the bulk of Italian movies of the period, is full of "borderline humor" that consistently borders on what some may call "poor taste". But that is exactly what makes this movie such a laugh riot! This is the type of movie where beautiful women get their dresses torn off by passing buses, blinds fly up at the wrong time and almost nothing is sacred.
Pierino, played by comic genius, Alviro Vitalli, is a juvenile who is determined to drive everybody up the wall, from his older sister at home, to the administration of his school.
Nothing is sacred and nobody in authority is safe from Pierino's pranks. Pierino will go to any length to torment his tormenters. For example, he walked past the school director with an "invisible dog" leash. The director asked him what he was doing. "Oh, walking my dog" replied Pierino. The director thought the "invisible dog" leash was Pierino's prank, until he turned around and saw some doggie droppings that Pierino had placed in the hall.
Pierino cannot stand his teacher, so he drives her up the wall until she quits. Then a new teacher comes in, who has Pierino head over heals in love. But does that mean he becomes a model student? Well, not quite.
A knowledge of the Italian language is required to understand the humor in this movie. It is a shame that there isn't a translated version of this movie. But if your ability to understand Italian isn't quite that good, there is still enough slapstick humor to leave you screaming in wild fits of hysterics.