A couple of weeks ago, paranoid, I'd be pulled over by the cops (and there were lots), it'd be a shit night at work, something always goes wrong...
And trying to root out the source of the superstition, I remembered first hearing of it when I was a kid, maybe 6 or 7, my mom was reading to me "Tom Sawyer", and it came down to that scene where Tom and Huck are digging for buried treasure, only they realize that it's Friday the 13th, and so give up and reschedule. No spoilers here. But an amusing recollection...