You look around and everything is normal. Suddenly, everyone around you starts dancing or clapping or doing something else. Welcome to the world of flash mobs. The first flash mob was organised by Bill Wasik by email. Nearly all of the early flash mobs were for fun. But it has gone on to mean many more things now. In Quebec, Canada, a woman was shocked by 2,000 people clapping together when she put a plastic bottle in the recycling bin. They were protesting about the lack of recycling in Quebec. Flash mobs have also been held to remember people who have died. Just weeks after the death of Michael Jackson, nearly 14,000 people performed the Thriller dance in Mexico City. Some people think the time of the flash mob is over. However, in 2014, a group of school children performed a flash mob to Pharrell Williams’ song Happy for their school friend Ryan Dunne, a 9-year-old boy who was fighting against a disease without treatment yet. This helped get 100,000 people to sign a petition to change a law in America. This number of signatures might save Ryan’s life, as the American government might make the new drugs available faster because of the petition. Perhaps flash mobs will have more uses in the future.