YMS, 11 months ago There's this 2013 blog post about it, reacting to a reader wondering how the "!!1" even survived the 404 page redesign a couple of years earlier: http://googlesystem.blogspot.com/2013/05/error-404-not-found1.html
There's this 2013 blog post about it, reacting to a reader wondering how the "!!1" even survived the 404 page redesign a couple of years earlier: http://googlesystem.blogspot.com/2013/05/error-404-not-found1.html