The number 13 has a long history of being unlucky. Pairing it with Friday, ensures that there are times to stop and be more cautious. Believers in the superstition of Friday the 13th as a bad luck day fulfill their own prophecy. That's because when something bad happens on the day, they will always remember it. The mind blocks out all the other uneventful Friday the 13ths.
Never Walk Under a Ladder»