score:11
Superstitions are hard to nail down as to the source, but this one doesn't seem to go back far and from what I have been told, in the US, it originates or resonates from the Last Supper. Jesus had 13 at the dinner the night before he was killed. So if you take many of the following sources at face value:
Places you can look: http://en.wikipedia.org/wiki/Friday_the_Thirteenth
http://urbanlegends.about.com/cs/historical/a/friday_the_13th.htm
Upvote:0
It is not actually a superstition as much as it is an historical event. The traditional association of Friday 13th comes from the Church's massacre of Knights Templar on Friday, October 13th, 1307.
The order was given by King Philip IV of France, due to a number of reasons. You can read about it in numerous books or get the quick and dirty from Wikipedia:
http://en.wikipedia.org/wiki/History_of_the_Knights_Templar#Fall