Oscar, divorced, lives alone and disorderly in a large apartment and once a week hosts friends for poker. One of those evenings Felix misses the appointment and arrives later announcing, very distressed, that he has separated from his wife. Oscar offers him hospitality and he accepts but Felix soon turns out to be a real pest for Oscar. A maniac about cleanliness and order and obsessed with the love of cooking, he makes Oscar's day, accustomed to a messier but simpler life, a real hell. The arguments, which remind the guest of those he had with his wife for many years, increase and reach their peak when one evening Oscar invites two women who live upstairs to his house. Felix's attitude and his whining with the girls spoils his evening: he is tired and kicks him out of the house but is worried about a possible desperate gesture that his friend might make. Shortly afterwards he sees him reappear accompanied by one of the two women, who welcomed him into their home.
