‘Friday the 13 th ’ is a feared phenomenon. The fear of ‘Friday the 13 th ’ is called “paraskevidekatriaphobia,” a word derived from the Greek words Paraskeví (Friday) and dekatreís (thirteen), attached to phobia (fear). Some people are so paralyzed by paraskevidekatriaphobia that they avoid normal activities, and some even refuse to come out of their homes. The origin of the link between bad luck and ‘Friday the 13 th ’ is vague. ‘Friday the 13 th ’ is thought to be a day of unlucky events, although the origins of such ideas are unclear. Consequently, several theories have been proposed about its origin. One theory states that it is a modern amalgamation of two older superstitions: that Thirteen is an unlucky number and that Friday is an unlucky day. Combining two unlucky elements into one day would make it all the more fearsome, and so it has become. The number twelve is considered as the number of completeness, as reflected in...