The doe-eyed Robert Pattinson had to cancel his Twilight signing after about 3,000 screaming fans showed up outside of the Stonestown Galleria in San Francisco. The unexpected numbers turned into a tween mob outside the mall where screaming fans pushed and trampled each other to get a closer look at Pattinson's lovely vampire mane, and giving me more evidence that the kiddies from Twilight are truly ushering in our inevitable apocalypse. [TMZ]