unexplained phenomenon
Google Australia displays the „unexplained phenomenon“ Google Doodle but no one really knows what it means. If you click it, you get the unexplained phenomenon search results page. Germany also has called „Rätselhaftes Phänomen“ which pretty much translates to unexplained phenomenon. Google Russia also has „необъяснимые явления“.
Google's homepage has an interesting doodle that shows a UFO and links to the search results for [unexplained phenomenon].
The doodle is self-referential because many people will think that the doodle itself is an unexplained phenomenon.
To make things more interesting, Google posted an encrypted message on its Twitter account:
1.12.12 25.15.21.18 15 1.18.5 2.5.12.15.14.7 20.15 21.19
decrypted as "All your O are belong to us", a reference to the popular Internet meme
