Watch | Pillow fights break out on the streets of Berlin, Hong Kong and Taipei

Armed to the teeth with pillows and many still in their pyjamas, hundreds of mostly young enthusiasts battled it out in Hong Kong and Taiwan on Saturday for the 7th annual International Pillow Fight Day.Hundreds more participants also turned up in front of Berlin's Brandenburg Gate to take part in the global pillow fight. There is no particular reason that is known for this festival to be celebrated . The only idea , some say , is to have fun.