Carnivorous monkeys run amok in San Francisco

[Cybrludite]

(Salvaged from the old place...)

Unknown to most people, there was a population of carnivorous monkeys of the family Hylobatidae who lived in the sewers under San Francisco. They hibernated for most of the year, and then would run amok in the Bay Area on the Winter Solstice, consuming most people who crossed their path. As far as science could tell, this was the only place on Earth where the creatures were able to gorge enough to keep themselves alive during their long hibernation. Why? [spoiler]Yule Gibbons only ate fruits & nuts…[/spoiler]

(Gets ready for the shower of blunt objects from the older forum members as well as the blank stares from the younger set...)