Following a broadcast on the radio, each of the listeners remembers these "little nothings" (the title is borrowed from a play by Mozart), which have often changed their lives. Each of these stories told will prove that a tiny detail in life can change an entire destiny.
After winning the lottery, the life of the happy winner turns into a nightmare. The movie consists of four separate stories divided into five parts. They tell the different stages of the winner's life, from discovering the reward to witnessing the consequences caused by the prize.
Meet Adrien! He's 35. He's stuck in a mid-life crisis. He's neurotic and hypochondriac. Tonight he's stuck in an endless family dinner and his girlfriend is not answering his texts. On top of that, his dumb brother-in-law asks him to prepare a speech for his wedding. Could it get even worse?
Baptiste, a talented imitator, is unable to make a living from his art. One day, he is approached by Pierre Chozène, a famous but discreet novelist, constantly disturbed by incessant calls from his publisher, his daughter, his ex-wife... Pierre, who needs peace and quiet to write his most ambitious text, then suggests that Baptiste become his 'answering machine' by pretending to be him on the phone... Little by little, Baptiste doesn't just imitate the writer: he develops his character!
Beatrice celebrates with her family the release of her book: she tells about the accident of her husband Frederic. He became blind and without filter - always so funny and seductive, he is totally unpredictable. But this book, hymn-to-life, will turn into a joyful fist because if Beatrice changed the names, each of his friends seeks to find his character. The book awakens secret jealousies, while the group of friends and family pitch.