Flash mobs involve large groups of people suddenly assembling in public spaces to perform unusual, pointless acts briefly before dispersing. They originated in 2003 and have since been used for advertising, protests, and entertainment through organization on social media. Flash mobs can involve choreographed dancing, freezing into living statues, or other abnormal actions, dress-up, or pillow fights, and are considered a form of performance art by expressing creativity through the body in public spaces for brief periods of time.