It's Friday the 13th. Art Cashin, the veteran trader at UBS Financial Services, notes that stocks tend to rally on Friday the 13th up to 60% of the time, despite all the myths associated with the day. In note Friday, Cashin also explains how traders dealt with the fear of this date in a tradition that's sadly disappeared. New York Stock Exchange traders called it Hat Day, and they wore headgear to ward off evil spirits. From his note: "We think the negative myth may be based on a novel published back around 1910. It told of a plot by an evil stock trader (ain’t they all) to crash the market on Friday the 13th. By a ... (full story)