OK, so this is a bit late, but on Friday the 13th I had the lucky misfortune to get a flat tire right after I had picked up my lunch.  As luck would have it, the holes were in the side of the tire and could not be repaired, I needed a new tire.  I then spent the next few hours putting the spare on and driving around town trying to find a place with a tire in stock for a replacement.  No one had any in stock so I had to order one and wait a week.

 

So, was it bad luck due to Friday the 13th, a coincidence?  To each his own.