A Friday occurring on the 13th day of any month is considered to be a day of bad luck in English and Portuguese-speaking cultures around the world. And similar superstitions exist in some other traditions.
Some people are so paralyzed by fear that they are simply unable to get out of bed when Friday the 13th rolls around. The Stress Management Center and Phobia Institute estimates that more than 17 million people are affected by a fear of this day.
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