Paraskevidekatriaphobia

Say that three times fast! It's the term for "fear of Friday the 13th." I'm not one to be afflicted by this, but it is rather entertaining to see what goes on during this day. Here's a pretty good article that I found. Even the all-powerful Loki had something to do with the folklore of this day!

There's probably a Friday The 13th movie marathon somewhere, too. =)