Back in the year 12 AD, do you think that anyone got all worked up over it being (actually) 12/12/12?
umerologists and calendar geeks alike are celebrating today, because it is the last day of the Gregorian calendar to feature the same number denoting the month, day, and year. And if you're not particularly bright and you believe in the Mayan Apocalypse, it's the final such day ever.
Roadies everywhere are also celebrating as the day also marks unofficial Mic Check Day ("Check 1-2, 1-2, 1-2" being the standard method for testing microphone levels).
Nitpickers and spoilsports are quick to point out that these numbers don't actually represent the true calendar date, which is 12/12/2012, but when you've got something as cool as 12/12/12 why spoil it?
Besides, back in the year 12 AD, do you think that anyone got all worked up over it being (actually) 12/12/12? Of course not. They were too busy worrying about things like repairing aqueducts and debating whether Tiberius would prove to be a better Emperor than Augustus, or whether it even mattered who was in office, since they're all crooks anyway.
According to numerologists, 12/12/12 represents something huge, since the number 12 is so packed with meaning (12 constellations, 12 apostles, 12 gates of the celestial city in Revelations, 12 sons of Ishmael, 12 gods of Egypt, 12 ganglions in the human body, 12 works of Hercules, 12 face cards in a deck, etc.). Also, it's exactly six years, six months and six days since June 06, 2006.
So spend today wisely. Buy a dozen of something, watch the clock to see when it's 12:12, and say "wow." Enjoy it while you can, because it only happens once.