The origins of the superstition surrounding Friday the 13th are not entirely clear, but it likely comes from a combination of religious and cultural beliefs. In Christian tradition, Friday is considered unlucky because it was the day of the week that Jesus was crucified, and the number 13 has been considered unlucky for centuries, possibly due to Norse or Christian mythology. Some theories suggest that the combination of Friday and the number 13 became synonymous with bad luck in the 19th century, and it wasnt until the 20th century that the superstition gained widespread popularity. The idea was popularized in the United States with the publication of a novel titled "Friday the Thirteenth" in 1907. However, it is important to note that there is no scientific evidence to support the idea that Friday the 13th is actually unlucky.