For those that keep count, every year will have at least one Friday the 13th, while some years, like this one, have two Friday the 13th. This year the second Friday the 13th is on December 13th (I let you guess which day). Once in a while there will be 3 Friday the 13th with the last time occurring during 2015. A year having 3 Friday the 13th on the average only happen about 15 times each century, with the next two occurring during 2026 and 2037. What is kind of interesting is that there are more Friday the 13th days than any other day of the week on a 13th. It is also thought that the Friday the 13th is more or less a modern thing as there seem to be no records or very few accounts of the idea of a Friday the 13th until sometime early during the last century.
Here is a link to an interesting article of the history of Friday the 13th. Thirteen: The Private History of a Curse