The 13th of any month has long been considered an unlucky day. Fridays are traditionally considered the unluckiest day of the week. Combine the two, and you have a double whammy of bad luck. But for some people, Friday the 13th is a special day. It is a day to celebrate the tradition of getting a tattoo. The tradition of getting inked on Friday the 13th has become so popular that it has become its own holiday.