Friday the thirteenth

I am not a superstitious person and I don't believe that Friday the 13th is an "unlucky" day. But I thought it was really interesting that within a week, we've had 07/07/07 which is supposed to be the lucky day, and then a Friday the 13th. In our lifetime, that will never happen again. Maybe someone who has way too much time on their hands will figure out when or if this will ever happen again.