Well actually two rare events, the second is me making a thread in this forum.
This has already happened for many, and for some it is yet to happen, and in either case it won't happen again for another 100 years...
But today, we will see 09:09:09 on 09/09/09
Enjoy it while it lasts.
More fun facts about 9:
* For any number divisible by 9, the sum of the digits is also divisible by 9
* If you repeatedly sum up the digits of such a number, eventually you get 9 (i.e. 1575 -> 1 + 5 + 7 + 5 = 18 -> 1 + 8 = 9)