A good word to know, and a particularly relevant word today, is: triskaidekaphobia.

Do you have this kind of phobia? You probably do if you are superstitious; triskaidekaphobia is the fear of the number 13, or the fear of Friday the 13th. It just so happens that that is today’s date—a fact that you would be more than aware of if you happen to be triskaidekaphobic.

Link: Reference.com—word of the day