Happy Friday the 13th!
Why is it so unlucky? One interpretation suggests that it is possible that the publication in 1907 of Thomas W. Lawson's popular novel Friday, the Thirteenth, contributed to disseminating the superstition. In the novel, an unscrupulous broker takes advantage of the superstition to create a Wall Street panic on a Friday the 13th. Hmmm.
Are you superstitious about Friday the 13th? And why?