On Saturday, people around the world took part in International Pillow Fight Day.
More than a hundred pillow fighters of all ages gathered in New York City's Washington Square Park.
Hundreds more participated at the National Mall in Washington, DC.
In Atlanta's Freedom Park, about 20 people came out to do battle.
The Urban Playground Movement organized the events. They say the goal is to get people outdoors to participate in fun social activities.
Pillow fights were held in more than a hundred cities worldwide.