People disguised as evil clowns caused the mass hysteria phenomenon at U.S. level. Everything is due to the promotional campaign of a short film that, clothed with fearsome clowns, spread by trying to kidnap children in schools in the United States and Canada. The media echo led to more cases and a total of hundreds of clowns. Believing that the population was terrifying, they came to ban clowning costumes in various places and in the vicinity of school, they even arrested several people for clown.