Friday the 13th: why is it unlucky and other facts about the worst day in the calendar Friday the 13th, considered by many as one of the unluckiest days of the year, is almost here again. If you are worried about what's in store this time, then you're not alone. Psychologists have even come up with a word for how you're feeling – paraskavedekatriaphobia, or fear of Friday the 13th. One option is to stay tucked up in bed all day to avoid any potential Friday the e 13th bad luck that may come your way, or alternatively, you could ignore the superstitious chatter and embrace it.