The calendar notation said that this is day number 313 in the year 2012. Yes, the first thing that came to mind is depicted above. 313 is Donald Duck's license plate number.
Then one observes that 313 is a simple palindrome; and the next step is to factor the number, which is a mental exercise that I have practiced for a long time: factoring license numbers. A quick calculation reveals that the number is prime.
There. Fun, arithmetic lesson, and more of the you-never-know-what-you-will-get on STSTT.