It’s Friday the 13th, which some consider being an unlucky day. Why?

According to TimeandDate.com, no one knows for sure. Research connects this unlucky day with everything from the Code of Hammurabi to the Last Supper.  The New York Times first referenced this as an unlucky day in 1908. Some writers like Chaucer reference Friday, though not necessarily the 13th, as an unlucky day. Some cultures think that the number 13 is the problem. In an article on CNN, scholars have traced the bad associations to the number 13 back to Norse mythology and some unfortunate shenanigans with Loki.

Other countries recognize other days to be unlucky. For example, Spain leans toward dreading Tuesday the 13th, and some folks in Italy dread the 17th of the month, no matter the day.

Not everyone thinks it’s unlucky. Taylor Swift is a fan, especially of the number 13. She told MTV in 2009, “I was born on the 13th. I turned 13 on Friday the 13th. My first album went gold in 13 weeks. My first No. 1 one song had a 13-second intro.” Her current Twitter handle is @TaylorSwift13. Midnights has 13 songs. It isn’t all bad, see?

This is just one superstition that doesn’t seem to carry a lot of weight. Hopefully, you have a great Friday the 13th. It’s Friday, for goodness sake.