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Revelers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, in London, England.
Mass public pillow fights were arranged in numerous cities around the world as part of the 'Urban Playground Movement,' which facilitates free, public non-commercial events.
Laszlo Beliczay / EPA
People participate in a pillow fight in Budapest, Hungary.
Eduardo Munoz / Reuters
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Ueslei Marcelino / Reuters
Wang Yuqing / Zuma Press