You wonder what that is? Maybe you have it an do not even know about it? Would be quite scary…
“Friggatriskaidekaphobia” is the fear of Friday 13th. Frigga being the name of the Norse goddess for whom “Friday” is named and triskaidekaphobia meaning fear of the number thirteen).
More info at http://en.wikipedia.org/wiki/Friday_the_13th
Happy Friday 13th to you 😉