Edit: Also, I'm just getting a 404 on the linked Google humans.txt file.
https://webcache.googleusercontent.com/search?q=cache:5FYB51...
http://humanstxt.org/
The joke is itself a play on the "robots.txt" protocol that sites use to indicate whether they may be crawled by search engines.
Google was quick to add it, though I'd hoped they would have enhanced it a bit by now. At least it hasn't washed away.
Original: https://news.ycombinator.com/item?id=2522220