There are many superstitions regarding the number 13. For example, in Britain it's considered a bad omen for 13 people to sit at a misfortune, even death, within a year. Others say it,s the last person to especially for the person closest to the door. The thirteenth day of the month isn't considered a good day on which to begin any new enterprise, including marriage, or to set out on a journey. M people believe that Friday the thirteenth is the unluckiest day in the year. This belief is so widespread that there are horror movies called Friday the Thirteenth.