Friday the thirteen of any month is considered a bad omen in Western culture, especially in England, Germany and Portugal... There are many legends about friday the 13th but the most popular one is from Christianity. In the Bible, judas the betrayer of jesus was the 13th guest of the last feast. In ancient Rome, the magicians used to form a group of 12 and the 13th person would be a devil. Friday is the day that Jesus was executed. For this reason, the legend about Friday the 13th has been spreeding all over the world for thousands of years.