Feathers will fly at this fun, flash-mob type event. Leave it to a place like San Francisco to host the most visible incarnation of the Pillow Fight's flash-mob-esque gathering, and subsequent public pillow fight. Experts guesstimate that past pillow fights have drawn around a thousand people.
There's something exhilarating and nostalgic about a pillow fight. Maybe that's why hundreds of people gather in spaces like Justin Herman Plaza for this highly anticipated annual event. Participants laugh as pillows fly and cotton fills the sky. Onlookers, and even cops, smile as they watch.