Over the weekend in San Francisco, the flash mob returned in force as an ad hoc group of "zombies" shambled down the street and "attacked" bystanders, passing out materials to create even more zombies to join in the fun.

Derek Powazek took some great photos of the event.

(via Waxy)

Update: Many more photos and accounts of the zombie infestation at the Apple Store at eatbrains.com.