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Let 'em fly! Pillow Fight Day celebrated around the world

Fabrice Coffrini / AFP - Getty Images

People attend a flash-mob pillow fight during the International Pillow Fight Day on Saturday.

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Fighters battle in Manhattan's Union Square during a massive pillow fight on Saturday in New York City.

Czarek Sokolowski / AP

Young people take part in a pillow fight on Pillow Fight Day at the Zamkowy square in Warsaw, Poland, on Saturday.

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A massive pillow fight in Manhattan's Union Square on Saturday.

Nelson Almeida / AFP - Getty Images

People attend a flash-mob pillow fight during the International Pillow Fight Day in Sao Paulo, Brazil, on Saturday.

Bea Kallos / EPA

Feathers swirl in the air as participants hit each other with pillows during the International Pillow Fight Day in Fovam Square in Budapest on Saturday.

Fabrice Coffrini / AFP - Getty Images

People attend a flash-mob pillow fight during the International Pillow Fight Day in Zurich on Saturday.

According to AFP, over 130 cities around the world are due to participate in the fourth annual edition of International Pillow Fight Day. 

International Pillow Fight Day sends feathers flying from Los Angeles to Hong Kong to Sao Paulo, Brazil.