The Parisian Transport Authority (RATP) renamed three Paris metro stations, but only for the 24 hours of April 1st. Parmentier station became "Pomme de Terre" (potato). Madeleine station became "Marcel Proust," and Reuilly Diderot station became "Les Religieuses." At the stations, metro employees handed out potato chips, madeleines, and religieuses (a type of eclair). Tickets were also stamped with the shape of a fish (a "poisson d'avril" or "April fish" — the French equivalent of "April fool").
Unfortunately, many passengers became confused by the name changes and chaos ensued. Therefore, the stunt was never repeated.