If you see people walking around San Francisco's Justin Herman Plaza with pillows Saturday night, they are not looking for a place to sleep.
Tonight is the Great Valentine's Day Pillow fight.
At 6pm, anyone with a pillow will start hitting each other. The rules are simple. No hitting anyone unless they have a pillow. Organizers are also asking people to only use pillows with natural material like down or cotton so that any debris will not harm the bay or wildlife.
Back in 2006, hundreds turned up for the pillow fight. Feathers and cotton ended up everywhere.
For more information: http://www.pillowfight.info/
