What’s So Bad About Friday the 13th?

It has nothing to do with a lunatic in a hockey mask.

This year will see three Friday the 13ths, the most possible in a calendar year. Recently, the holiday has been mostly used for themed bar nights and marathons of a certain movie series. But what led people to associate this day and date with unfortunate fates in the first place?

In the video above, some common explanations.