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Photos: Revelers celebrate 'International Pillow Fight Day'

Natasha Quarmby/Demotix/Corbis

And a happy International Pillow Fight Day to you and you and you.

Why? Why not, says the Urban Playground Movement, which encourages people around the world to organize the free, all-age celebration.

Revelers got into the pillow-swing of things accordingly — check out the whimsical, carefree photos, below. --Sarah Eberspacher