Friday the 13th is considered an unlucky day by many people around the world. This superstition dates back to ancient times and is believed to have originated from various sources, including the Last Supper and the Knights Templar. Many believe that bad luck or misfortune is more likely to occur on this day. In some countries, people avoid traveling, signing contracts, or even getting married on a Friday the 13th. Businesses may also experience lower sales on this day.