Totally didn't notice until I checked my watch for the date that today is Friday the 13th!!! So it got me thinking, what's so special about this combination of date and day? So I googled it, and came up with the following:
Fridays are hailed as a particularly significant day in the Christian tradition. Obviously, there is Good Friday, the day Jesus Christ was crucified. But according to Christian lore, Adam and Eve also supposedly ate the forbidden fruit on a Friday, the Great Flood started on a Friday, the builders of the Tower of Babel were tongue-tied on a Friday and the Temple of Solomon was destroyed on a Friday. Of course, the Bible doesn't specifically note many these events occurring on Fridays.
The word "Friday" is, in fact, derived from a Norse deity who was worshipped on the sixth day of the week and who represented marriage and fertility. Fridays in the early Norse culture were associated with love and considered a good day for weddings. Over time, however, mythology transformed the Norse fertility goddess into a witch, and Fridays became an unholy Sabbath.
In addition to the legendary significance of Fridays, the sixth day of the week also was execution day in ancient Rome and later Hangman's Day in Britain, according the Emery's Web site.
The number 13 also has mythological and religious symbolism.
Both the Hindus and Vikings reportedly had a myth in which 12 gods were invited to a gathering and Loki, the god of mischief, crashed the party and incited a riot. Tradition in both cultures holds that 13 people at a dinner party is bad luck and will end in the death of the party-goers.
Following in that vein, the Last Supper in Christian tradition hosted 13 people and one betrayed Christ, resulting in the crucifixion.
The number 13 also has been associated with death in other cultures. The ancient Egyptians, for example, believed life unfolded in 12 stages, and the 13th stage was death.
Then, there's the event that ties the two superstitions together.
It was on Friday, Oct. 13, 1307, that France's King Philip IV had the Knights Templar rounded up for torture and execution. The Knights Templar were an order of warriors within the Roman Catholic Church who banded together to protect Christian travellers visiting Jerusalem in the centuries after the Crusades. The Knights eventually became a rich, powerful and allegedly corrupt order within the church and were executed for heresy.