Maybe Stevie Wonder had it right when he sang:

Very superstitious, writing’s on the wall,
Very superstitious, ladders bout’ to fall,
Thirteen month old baby, broke the lookin’ glass
Seven years of bad luck, the good things in your past.
When you believe in things that you don’t understand,
Then you suffer,
Superstition ain’t the way

Well, if you’re going to fret about today anyway, at least read the history of triskaidekaphobia. Find out why superstitious people get upset and suffer from the heebie-jeebies when they think about this day. Find out how stuff like this “bad day” superstition works. I mean, what’s so important about the number thirteen, right? Attaching any importance to an ordinary number like thirteen is a prime example of superstitious thinking. Like Archimedes, the famous Greek philosopher, a fellow who favored reason, we should look for solid examples of rational thought.