What is 'Friggatriskaidekaphobia'?
'Friggatriskaidekaphobia' is when a person has an irrational fear of a month's 13th day falling on a Friday. A long-standing legend claims that such a day and date is 'unlucky', with number 13 being considered 'unlucky' in many cultures. There is at least one Friday the 13th every year, while there can be a maximum of three.