Google is afraid of zombies :)
If you take a quick look at Google’s robots.txt file you will se the following lines added:
User-agent: zombies Disallow: /brains
It seems that in this evening zombies will be crawling even on the internet and Google took some measures in order to protect the search engine from unwanted service disruption caused by zombies 
If you didn’t figured it yet out … It’s Halloween !!!
Even Google’s logo was altered today to mark this so popular event in the USA.
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They want to assure that Pagerank won’t be sucked out from their machines.
RLOL