A lot of funny things and superstitions are associated with Friday the 13th. In my family its nothing but good superstitions as my crazy Brady Bunch of family was created on Friday, February 13th 1987, exactly 28 years ago when my mom and step dad met and fell in love. From then on many great things have happened to my family on Friday the 13th, and I even have an all black cat named Moses that I adore, so I guess I am not much for bad superstitions.
Friday has been considered an unlucky day to undertake journeys or begin new projects at least since the 14th century. Friday the 13th, also known as Black Friday, is considered an unlucky day in Western superstition. It occurs when the 13th day of the month falls on a Friday.
There were 13 people at the table (at the Last Supper) and the 13th was Jesus. The Last Supper was on a Thursday, and the next day was Friday, the day of crucifixion. When '13' and Friday come together, it is a double whammy.