International Pillow Fight Day

People across the globe in more than 130 cities participated in the fourth annual International Pillow Fight Day on Saturday April 2, 2011. Here are some pictures from the event. (Also see Mass Pillow Fight in Berlin)

People attend a flash-mob pillow fight in Zurich on Saturday. (Photograph: Fabrice Coffrini / AFP/ Getty Images)

Feathers fly at a pillow fight in Zurich, Switzerland (Photograph: Fabrice Coffrini/AFP/Getty Images)

Pillow fight in Trafalgar Square, London. (Photograph: Ray Tang/Rex Features)

Brasilia, Brazil (Photograph: Ueslei Marcelino /Reuters)

Feathers fly in the air in Fovam Square, Budapest, Hungary (Photograph: Bea Kallos/EPA)

Budapest, Hungary (Photograph: Bea Kallos/EPA)

London (Photograph: Ray Tang / Rex Features/Rex Features)

A massive pillow fight in Manhattan's Union Square on Saturday. (Photograph: Mario Tama / Getty Images)

Fighters battle in Manhattan's Union Square (Photograph: Mario Tama / Getty Images)

Manhattan's Union Square during a massive pillow fight (Photograph: Mario Tama/Getty Images)

A person in a chicken suit walks down the street with a pillow after the city's sixth event, held at Union Square New York City. (Photograph: Jessica Rinaldi/Reuters)

A man uses a leaf blower to assist a man covered in feathers in Manhattan's Union Square (Photograph: Mario Tama / Getty Images)

People pillow fighting in Union Square, New York City (Photograph: Erik Pendzich/Rex Features)

People attend a flash-mob pillow fight in Sao Paulo, Brazil, (Photograph: Nelson Almeida / AFP - Getty Images)

Sao Paulo, Brazil, (Photograph: Nelson Almeida / AFP - Getty Images)

Pillow fight in full swing in the capital of Bulgaria. (Photograph: Stoyan Nenov / Reuters)

Young people take part in a pillow fight at the Zamkowy square in Warsaw, Poland (Photograph: Czarek Sokolowski / AP)