“Friday the 13th: where the sceptics stay safe, the superstitious stay home, and the reckless secure their Darwin Award.”

There’s something gloriously ironic about Friday the 13th—it’s supposed to be the unluckiest day of the year, yet statistically, it’s one of the safest. Yep, you read that right. Superstition, it turns out, is a brilliant safety net.

Think about it: the people who normally fling themselves headfirst into risky situations suddenly decide to dial it back for the day. The bloke who usually speeds through intersections takes an extra second to look both ways. The thrill-seeker who was definitely going to try wingsuit flying reconsiders their life choices. And those of us who aren’t ruled by superstition? Well, we reap the benefits of a world that’s momentarily being more careful. Cheers for that, irrational fear!

But here’s the kicker—Friday the 13th isn’t the only day people panic about. Different cultures have their own doom-laden dates, and some of them are even stranger than ours. Let’s take a tour of global bad-luck days, shall we?

Tuesday the 13th – Spain & Greece’s ‘Hold My Sangria’ Moment

We Kiwis tend to think of Friday the 13th as ominous, but Spain and Greece say, “Nah mate, it’s Tuesday the 13th you’ve got to watch out for.” Why? Because Tuesday is ruled by Mars, the god of war, and if history’s taught us anything, it’s that war rarely goes well. Combine the fiery energy of Mars with the number 13’s chaotic rep, and you’ve got a recipe for absolute carnage (or at least a mild case of existential dread).

What do people do about it? Well, they generally avoid important life decisions, air travel, or risky investments—so if your Spanish mate suddenly cancels a meeting on a Tuesday the 13th, don’t take it personally. They’re just dodging cosmic catastrophe.

April 4th – China & Japan’s ‘That’s a Bit Grim’ Day

Now, this one isn’t about an unlucky weekday—it’s about the number four itself. In China and Japan, four (四, shi) sounds eerily similar to the word for death (死, shi), so naturally, people are a little wary of it. Hospitals often skip Room 4, apartment complexes sometimes avoid a fourth floor, and don’t expect to receive four of anything as a gift—it’s just not done.

Now, you might think, “Hey, what about seven (shichi)? That kinda sounds like shi too, right?” Well, some Japanese folks do avoid it for that reason, but it’s nowhere near as feared as four. Plus, Japan has the Seven Gods of Luck, so seven kinda balances out its own dodgy pronunciation.

Would this superstition make April 4th statistically safer? Maybe! If enough people stay home or avoid risky behaviour, you end up with fewer accidents. But let’s be honest—if fate’s got it in for you, it’s not going to check the calendar first.

September 9th – Japan’s ‘Double Trouble’ Day

If four (shi) is considered unlucky in Japan, nine (kyuu or ku) doesn’t get off lightly either. The word for nine (九, ku) sounds a bit too close to 苦 (ku, suffering or hardship) for comfort, making 9/9 a day that some people associate with misfortune.

Fortunately, this superstition isn’t quite as widespread as the fear of four, but it’s enough that some people avoid scheduling major events on September 9th. To balance things out, some prefer saying “kyuu” instead of “ku” to soften the association. Still, when your bad luck numbers are at both ends of the scale, it’s fair to say Japan’s got numerical superstition covered.

Friday the 17th – Italy’s ‘Rearrange the Numbers and Panic’ Day

The Italians don’t stress about Friday the 13th, but bring up Friday the 17th, and suddenly, everyone’s clutching their lucky charms. Why? Because in Roman numerals, 17 is written as XVII, which can be rearranged to spell VIXI—a Latin word meaning “I have lived”… which is basically the ancient equivalent of “Well, that’s me done.”

Not exactly the vibe you want when booking a holiday or going in for surgery, right? So in Italy, hotels sometimes skip Room 17, and some airlines steer clear of a Row 17. No one’s taking chances with symbolic death messages.

So, What’s the Takeaway?

Turns out superstition isn’t just about irrational fear—it actively changes behaviour. Whether it’s Friday the 13th making people drive cautiously or Tuesday the 13th convincing Spaniards to reschedule their business meetings, fear can be oddly productive.

Maybe instead of dismissing these dates, we should embrace them. After all, if believing in bad luck makes people act safer… maybe we could just invent Monday the Whateverth and trick everyone into driving carefully every week? Food for thought.