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Even more cryptic: a TwitPic posted to Google's Twitter account carries the message "1.12.12 25.15.21.18 15 1.18.5 2.5.12.15.14.7 20.15 21.19 ", which a commenter on that image translates to "All Your o Are Belong To Us" (a reference to All Your Base).
We, like many web users, are somewhat flummoxed. Could Google be observing the Exeter UFO Festival, an obscure and tiny celebration being held today? Did we miss a key anniversary in the history of space exploration, perhaps? Or is Google just messing with our minds on what they knew would be a quiet Labor Day weekend?