Ouf, tout est pret. Marc a tout prevu et tout regle pour que l'anniversaire de Sabine soit une reussite. Il a trouve le cadeau ideal et les parents de sa fiancee ont accepte de venir feter l'evenement avec eux. Mais c'etait compter sans le retour inopine d'une ex-petite amie par trop jalouse, d'une locataire gateuse, d'une secretaire idiote, d'un concierge decontracte, d'un accidente acariatre, d'Antillais plus ou moins clandestins, d'une Polonaise nue. Il y a des jours comme ca, des journees de reve qui virent au cauchemar (This is an important day for Marc Chanois, an insurance advisor heading toward middle age: it's his fiancée Sabine's birthday, her parents arrive in Paris and Marc will meet them for dinner to announce the engagement (her father can't stand him), he's bought Sabine a Spitfire, and his most important client is to sign a policy. But, as the day wears on, he's vexed by an incompetent secretary, the unexpected return of a girlfriend he hasn't seen in five years, squatters who use his office at night, the jealous former lover of a flight attendant who lives in the building, and his boss's unexpected return from a Swiss clinic. Will he reach Sabine in one piece?)