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Participants throw their pillows during the International Pillow Fight Day at Liberty Square, in Taipei, Taiwan. REUTERS/Tyrone Siu
People fight with pillows during World Pillow Fight Day in Vienna, Austria. REUTERS/Leonhard Foeger
People start to fight with pillows during World Pillow Fight Day in Vienna, Austria. REUTERS/Leonhard Foeger
Participants take part in International Pillow Fight Day in Kennington Park in south London, Britain. REUTERS/Neil Hall
Participants take part in International Pillow Fight Day in Kennington Park in south London, Britain. REUTERS/Neil Hall
People fight with pillows during World Pillow Fight Day in Vienna, Austria. REUTERS/Leonhard Foeger
People fight with pillows in front of the Brandenburg Gate during World Pillow Fight Day in Berlin, Germany. REUTERS/Pawel Kopczynski
People fight with pillows during World Pillow Fight Day in front of the City Hall in Copenhagen, Denmark. REUTERS/Nikolai Linares/Scanpix Denmark
Participants take part in the International Pillow Fight Day at Liberty Square, in Taipei, Taiwan. REUTERS/Tyrone Siu
Participants take part in International Pillow Fight Day in Kennington Park in south London, Britain. REUTERS/Neil Hall
People fight with pillows during World Pillow Fight Day in Vienna, Austria. REUTERS/Leonhard Foeger
People fight with pillows during World Pillow Fight Day in Vienna, Austria. REUTERS/Leonhard Foeger
People fight with pillows during World Pillow Fight Day in front of the City Hall in Copenhagen, Denmark. REUTERS/Nikolai Linares/Scanpix Denmark
Participants take part in International Pillow Fight Day in Kennington Park in south London, Britain. REUTERS/Neil Hall
People fight with pillows during World Pillow Fight Day in Vienna, Austria, April 2, 2016. REUTERS/Leonhard Foeger
People fight with pillows during World Pillow Fight Day in Vienna, Austria. REUTERS/Leonhard Foeger
People fight with pillows in Pariser Platz during World Pillow Fight Day in Berlin, Germany. REUTERS/Pawel Kopczynski
People fight with pillows during World Pillow Fight Day in Vienna, Austria. REUTERS/Leonhard Foeger
People fight with pillows in front of the Brandenburg Gate during World Pillow Fight Day in Berlin, Germany. REUTERS/Pawel Kopczynski
Participants take part in International Pillow Fight Day in Kennington Park in south London, Britain. REUTERS/Neil Hall
Participants take part in the International Pillow Fight Day at Liberty Square, in Taipei, Taiwan. REUTERS/Tyrone Siu
People fight with pillows during World Pillow Fight Day in Vienna, Austria. REUTERS/Leonhard Foeger
People fight with pillows during World Pillow Fight Day in Vienna, Austria. REUTERS/Leonhard Foeger
People fight with pillows in Pariser Platz during World Pillow Fight Day in Berlin, Germany. REUTERS/Pawel Kopczynski
People fight with pillows in front of the Brandenburg Gate during World Pillow Fight Day in Berlin, Germany. REUTERS/Pawel Kopczynski