"This is not a good day for paraskevidekatriaphobics -- those who fear Friday the 13th. It's double-13 Friday. All the numbers in the numerical notation -- 10/13/2006 -- add up to 13 as well, giving great pause to the superstitious.
The phenomenon hasn't happened in 476 years, said Heinrich Hemme, a physicist at Germany's University of Aachen who crunched the numbers to find that the double-whammy last occurred Jan. 13, 1520."
Source: Washington Times via Slashdot