Any Friday which falls
on the thirteenth day of the month.
Friday is the unluckiest day of the week for Christians, who believe that
Christ was crucified on this day.
They also believe the number thirteen to be unlucky because there were
thirteen present at the Last Supper, so Friday the 13th is a double wammy.
The superstition of thirteen actually goes back farther.
In Norse mythology there were thirteen present at a banquet in Valhalla
when Balder (son of Odin) was slain, which led to the downfall of the gods.
Around 1000 B.C., Hesiod wrote in
Works and Days that the thirteenth day is unlucky for sowing, but
favorable for planting.
Friday the 13th will happen between one and three times in any given year.
France
