friday the thirteenth

so why is friday the thirteenth so unlucky?

well my favorite explanation concerns the knights templar:

"During the Middle Ages, the superstition against Friday the 13th grew. On Friday, October 13, 1307, King Philip IV of France ordered the arrests of Jaques de Molay, Grand Master of the Knights Templars and sixty of his senior knights in Paris. Thousands of others were arrested elsewhere in the country. After employing torture techniques to compel the Templars to "confess" to wrongdoing, most were eventually executed and sympathizers of the Templars condemned Friday the 13th as an evil day."

From here.