Union Square April 2, 2011. My sister and I were about to go into the subway station when we saw this. Googled it later and found this: pillowfightday.com/
<a rel="nofollow" class="external text" href="https://vimeo.com/user4693811">Eunice Lee</a>
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<a href="//commons.wikimedia.org/wiki/Category:Vimeo" title="Category:Vimeo">Vimeo</a>: <a rel="nofollow" class="external text" href="https://vimeo.com/21856381">Pillow Fight Day 2011</a> (<a rel="nofollow" class="external text" href="//web.archive.org/web/*/https://vimeo.com/21856381"><span style="color:#9602fc">view archived source</span></a>)