Friday the 13th, a day associated with bad luck, has various origins and superstitions surrounding it. One belief connects it to the Last Supper, where there were 13 individuals present, including Judas who betrayed Jesus. Another theory links it to the arrest of the Knights Templar on Friday, October 13, 1307. The number 13 is often seen as unlucky due to its disruptive nature compared to the harmony of the number 12.
May 13—100 Years Ago May 13, 1921 Beware! Today is hoodoo day — Friday, the 13th, and the only hoodoo day of the year of 1921. A diligent study of the Friday column in the calendars show that it is impossible for a year to be adjusted without the fateful day of the week corresponding with the unlucky numbers once at least. So 1921 is as little unlucky as it is possible for any year to be. One .