London marks International Pillow Day with pillow fight
5 April 2015 Last updated at 10:41 BST
Hundreds of people have gathered in Trafalgar Square in London to mark International Pillow Day.
It is an annual event that takes places across the globe and a chance for people to have a friendly fight with each other using pillows.
Big pillow fights also took place in Romania, the Netherlands and Hong Kong.
But there were a few rules for pillow fighters to follow: don't hit anyone without a pillow, don't hit anyone with a camera, and take your pillow home.