International Pillow Fight Day celebrated around the world

Youngsters engage in a pillow fight in Bucharest, Romania, Saturday, April 5, 2014. People gathered for a flashmob event in Bucharest, along with people in other cities worldwide on Saturday, for a pillow fight to mark the International Pillow Fight Day. (AP Photo/Vadim Ghirda)

Youngsters embrace while taking a break from a pillow fight in Bucharest, Romania, Saturday, April 5, 2014. (AP Photo/Vadim Ghirda)

People meet for the International Pillow Fight Day in the Westpark in Berlin, Germany, Saturday April 5, 2014. (AP Photo/dpa, Maurizio Gambarini)

Feathers fly on International Pillow Fight Day in the Westpark in Berlin, Germany, Saturday April 5, 2014. (AP Photo/dpa, Maurizio Gambarini)

Youngsters engage in a pillow fight downtown Bucharest, Romania, Saturday, April 5, 2014. Romanians took part in large numbers in a pillow fight to mark the International Pillow Fight Day. (AP Photo/Vadim Ghirda)

Young people participate in a pillow fight to mark the International Pillow Fight Day in Budapest, Hungary, Saturday, April 5, 2014.  (AP Photo/MTI, Bea Kallos)

Youngsters engage in a pillow fight in Bucharest, Romania, Saturday, April 5, 2014. People gathered for a flashmob event in Bucharest, along with people in other cities worldwide on Saturday. (AP Photo/Vadim Ghirda)

Young people amuse themselves taking part in a pillow fight during the pillow fight day in Lausanne, Switzerland, Saturday, April 5, 2014.  (AP Photo/Keystone,Laurent Gillieron)

Approximately 100 people took part in the pillow fight in Lausanne, Switzerland.  (AP Photo/Keystone,Laurent Gillieron)

A girl takes a break from a pillow fight downtown Bucharest, Romania, Saturday, April 5, 2014. (AP Photo/Vadim Ghirda)

Kids run holding pillows during a pillow fight downtown Bucharest, Romania, Saturday, April 5, 2014.  (AP Photo/Vadim Ghirda)

Feathers explode out of a split pillow, mid-swing at the annual International Pillow Fight Day event, Saturday, April 5, 2014, at Westlake Park in Seattle, Wash. This year's fight was themed superheroes versus villains. (AP Photo/seattlepi.com, Jordan Stead)

With feathers covering the ground, people of all bed sizes took to friendly, fabric-soft warfare at the annual International Pillow Fight Day event Saturday, April 5, 2014, at Westlake Park in Seattle, Wash. (AP Photo/seattlepi.com, Jordan Stead)

Fabric and feathers got to swinging at the annual International Pillow Fight Day event Saturday, April 5, 2014, at Westlake Park in Seattle, Wash. (AP Photo/seattlepi.com, Jordan Stead)

All smiles at the annual International Pillow Fight Day event Saturday, April 5, 2014, at Westlake Park in Seattle, Wash. (AP Photo/seattlepi.com, Jordan Stead)

One man employs a behind-the-head strike at the International Pillow Fight Day event Saturday, April 5, 2014, at Westlake Park in Seattle, Wash.  (AP Photo/seattlepi.com, Jordan Stead)

People of all bed sizes took to friendly, feather-soft warfare at the annual International Pillow Fight Day event Saturday, April 5, 2014, at Westlake Park in Seattle, Wash. (AP Photo/seattlepi.com, Jordan Stead)

Feathers fall amongst the weekend warriors of the annual International Pillow Fight Day event Saturday, April 5, 2014, at Westlake Park in Seattle, Wash. (AP Photo/seattlepi.com, Jordan Stead)