In Naples, Professor Bellavista is a retired man, passionate about the philosophy and thought of Ancient Greece. Every day, in his luxurious apartment, he teaches his lessons of life to the poor-nothing (his friends), who are dazzled by his reasoning. One day, however, the quiet life of the building of Bellavista will be disturbed by the arrival of a director of Milan. Between Naples and Milan there contrast, because the Neapolitans are accustomed to enjoy a quiet life, always based on the "philosophy of pleasure and delay", while the northern Italians are very strict and punctual.

A Count marries a woman with illness that makes her suffer attacks of vampirism. The Count took flight in the wildest horror, and ran, without any idea where he was going or what he was doing, impelled by the deadliest terror, all about the walks in the park, till he found himself at the door of his own Castle as the day was breaking, bathed in cold perspiration. Involuntarily, without the capability of taking hold of a thought, he dashed up the steps, and went bursting through the passages and into his own bedroom.

Luca Cupiello, like every Christmas, prepares the crib, amid the disinterest of his wife Concetta and his son Tommasino. Ninuccia, the other daughter, writes a letter to her husband in which she communicates that she leaves him for her lover. The letter happens in the hands of Luca who hands it over to his son-in-law, who thus learns of his wife's betrayal. During lunch on Christmas Eve, the two rivals, who were confronted by Luca's carelessness, clash violently.