search for images and you get something special.
Nobody knew where this originated. The only known thing is that the oldest photo was found on Flickr, april 6th, 2009 and had the number as an only tag.
The whole thing became a hype in december 2010, and seemt to become a meme now, with FB, Tumblr, Flickr, and even a website devoted to it.
Later it has become clear that the whole action was set up by David Horvitz, a New York based artist known for his often eccentric DIY instructional projects, posted a picture with his head in the freezer on his Flickr account san pedro glue stick.
The whole thing seems to go viral these days, so expect to see it recur in the next few weeks.