If you were walking down Michigan Avenue on Saturday March 22, you may have seen a few passers-by carrying pillows. “That’s odd,” you may have thought, then gone about your business. But at 2 P.M. on the corner of Monroe and Michigan Avenue, pillows collided and feathers flew in the celebration of National Pillow Fight Day.

This isn’t just a Chicago phenomenon - celebrations were held in Copenhagen, London, Paris, Boston, Los Angeles, New York, and the list goes on.