: Long considered "irregular" compared to the "perfect" 12 (12 months, 12 zodiac signs, 12 gods of Olympus). In Christian tradition, Judas was the 13th guest at the Last Supper.
The superstition, known technically as , is a "double whammy" of two ancient anxieties: Venerdì 13
: Historically regarded as an unlucky day to begin any new venture. In Norse mythology, Frigg (the goddess Friday is named after) was sometimes depicted as a witch, and in Christian lore, Friday was the day of the Crucifixion. History or Hollywood? : Long considered "irregular" compared to the "perfect"
Interestingly, the specific combination of "Friday" and "13" as a day of bad luck didn't fully take hold until the . In Norse mythology, Frigg (the goddess Friday is
: Some studies suggest there are actually fewer accidents on Friday the 13th—not because of magic, but because people are so nervous that they drive and act more cautiously than usual.