Halloween easter egg: Google protects itself from zombies
You probably saw Google’s Halloween logo today:
But you may not have noticed that Google made another change for Halloween. Check out Google’s robots.txt file today:
That’s right. Zombies are disallowed from accessing /brains on Google today. You can never be too safe! 
Hat-tip to Google Blogoscoped spotting it first and to Search Engine Land for a round-up of Halloween logos.