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PORTLAND, Maine (NEWS CENTER) -- Saturday was National Pillow Fight Day, and Mainers wanted to celebrate with the rest of the world.

People in Portland marked the occasion in Monument Square. They were encouraged to show up in costume, because this year's theme was "Superheros vs. Villains."

They did set up a few rules: swing lightly, use soft pillows only, and be sure to remove eye glasses beforehand.

More than 100 cities worldwide celebrated - including Paris, Zurich, and even Australia.

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