Participants throw their pillows during the International Pillow Fight Day at Liberty Square, in Taipei, Taiwan. Photo by Reuters : Feathers fly on International Pillow Fight Day

Participants take part in International Pillow Fight Day in Kennington Park in south London. Photo by Reuters : Feathers fly on International Pillow Fight Day

People fight with pillows in Pariser Platz during World Pillow Fight Day in Berlin, Germany. Photo by Reuters : Feathers fly on International Pillow Fight Day

People fight with pillows during World Pillow Fight Day in Vienna, Austria. Photo by Reuters : Feathers fly on International Pillow Fight Day