Lucha de almohadas. Buenos Aires pillow fight
Parque Tres de Febrero, in front of the Planetario building (Palermo), descended into pure feathery chaos, as Argentina’s 1st ever flash mob event took place - a ‘Lucha de Almohadas’. Basically, a massive outdoor pillow fight between a group of total strangers, arranged over the internet.
There must have been thousands there*, pillows in hand and ready for the fight, and possibly almost as many taking pictures and videos with their cameras.
Even the Argentinian Government posted about it on their blogsite :)