So, this year we have three Friday the 13ths. Today, March, and November. We're not meant to pay attention to superstitions, but so many people do.
Here's the wikipedia article on it Friday the 13th. I know, Wiki, but it's interesting.
For me, Friday the 13th is a horror movie that has been run into the ground. I think they've made 20 sequals? And they've just released a remake of it.
Highlight of this remake? Jared Padalecki.