Dr. Stem, a world-renowned specialist in obsessive-compulsive disorder, or OCD for short, is waiting to see his patients. The six people chatting in his waiting room have had to wait many months for an appointment. But the eminent therapist is delayed, stuck in Frankfurt due to flight disruptions. As they chat and play Monopoly to pass the time, the patients get to know each other and even try group therapy... punctuated by each other's uncontrollable tics!

Paul, a businessman, is about to radically change his life... He has planned everything down to the smallest detail: the lucrative sale of his website to a Russian company, his divorce from his wife Valérie, and his departure for a paradise island with his mistress. The only person privy to his scheme and plans is his friend Michel, a computer genius who is naive and prone to blunders, but who follows Paul like a beacon... But on the eve of this fateful day, everything changes: a short circuit causes the oven to explode just as Paul is in the kitchen. He emerges unscathed, but against all odds, he has completely lost his memory. With the help of a doctor specializing in amnesia, Michel will do everything he can to help his friend, because time is of the essence: Ilona, the emissary from the Russian company, is expected to arrive any moment to finalize the contract.