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. Very interestingly the previous one was 13 weeks ago on – yes, wait for it… in September on Friday the 13th!
Last year there were three of these days, but on the average those years only happen about 15 times each century. 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.