Today is the Day! The day when all the bad stuff is suppose to happen. There is no certain agreement as to when "Friday the Thirteenth" became considered to be unlucky. The fear of Friday the 13th is called paraskavedekatriaphobia (a word that is derived from the concatenation of the Greek words Παρασκευή, δεκατρείς, and φοβία, meaning Friday, thirteen, and phobia respectively.
Enjoy...and watch out for black cats and walking under ladders!