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The thing is, our brain is super good at picking up on coincidences and forgetting everything else, so you'll always remember the weird stuff that happened on a 13 but never the other 50 thirteenths where nothing special went down 🧠 Most of the bad luck "on the 13th" is just classic confirmation bias. That said, don't mix up "it's a superstition" with "it's dumb to believe in it" - if it really stresses you out, it's not crazy to avoid that date for important stuff just for your peace of mind.

It's clearly just a superstition, there's no scientific basis to it. The thing is, our brains love finding patterns and connections, even when there aren't any. So if you have a bad day and it happens to be the 13th, you're gonna remember it, but the 50 other 13ths where nothing special happened, you completely forget about them. That's how superstitions survive for centuries - we hold onto the coincidences that fit the belief and discard everything else.

The origins vary depending on the culture, but it's mostly religious or mythological stories that got passed around. Over time, it just becomes something we hand down without really thinking about it, like "oh yeah, the 13th is bad luck". But honestly, I've never seen anyone actually have a run of bad luck on the 13th more than any other day - you've got annoying stuff happening every day of the week regardless of the number. If it stresses you out, that's your call, but you gotta know it's just your brain playing tricks on you, not the number itself.

The other answers talk about cognitive bias, and it's true that we pick information that confirms what we believe. But you can't forget that the superstition around 13 comes from pretty concrete historical sources. The Last Supper had 13 guests, Judas was the 13th, and then there were supposed misfortunes after that. Same thing with Friday the 13th. So it's not just made-up nonsense - it's a superstition with roots, even if of course there's no magical mechanism behind it.

Now, to answer honestly: does 13 really bring bad luck? No, clearly not. There are billions of people born on the 13th, who have normal days on that date, and zero problems. But psychologically speaking, if you really believe in it, it can affect your behavior without you realizing - you'll be more stressed, you'll anticipate negative things, and boom, you'll notice them more. It's more of a mental trap than actual bad luck.

If you personally stress about the 13th, the simplest thing is just to ignore it. Numbers are neutral - it's what we make of them mentally that matters.

You've fallen into the classic trap: the more you think about 13, the more you're going to notice it everywhere and forget all the normal days when nothing special happened. It's just mental mechanics, not real bad luck. The thing nobody really thinks about is that this superstition can become a real problem if you start avoiding stuff, like not taking a flight or changing your plans - that's when you're actually sabotaging yourself for real, regardless of the number.

The others are right about cognitive bias, but nobody mentioned something obvious: if you really BELIEVE that 13 is unlucky, you're literally going to be more stressed that day, and stress makes you mess up more often, you're less attentive, you sleep poorly. So you end up creating the problems yourself! It's a vicious cycle where the superstition becomes self-fulfilling just because you're thinking about it.

Historically, the fear of the number 13 mainly comes from the Last Supper (13 guests) and Friday the 13th being associated with Christ's death, so it didn't come out of nowhere. But me, I've got nothing special to tell about that number - I've had rough days on the 13th, but also normal days or actually pretty good ones, just like any other day of the week. What others say about cognitive bias makes sense: we remember the stuff that fits the belief and forget the rest, it's automatic in the brain.

The number 13 has a bad reputation mainly because of the Last Supper, where Judas was the 13th guest, and that spread through Western culture over centuries. But yeah, it's totally a superstition - your brain is just gonna remember the crappy days that fall on the 13th and forget the 99% of 13ths where nothing special happened. Personally, I've never seen any real correlation between that number and bad luck, it's just mental noise.

Personally I don't believe in it at all, and I think the other answers talking about cognitive bias are completely right! Like, I planted seedlings on the 13th last month and they're growing perfectly, zero problems, but I'm sure if it had gone badly I would've immediately thought "oh yeah it's because of the 13th"!

What kills me is that we always remember the weird stuff and forget about the 99 other 13ths where nothing abnormal happened. Our brain is programmed to find patterns everywhere, even where there aren't any. It's pure psychology, not magic!

There are studies showing that people notice stuff way more when they're thinking about it - that's the frequency illusion effect. Personally I've never seen any difference between the 13th and any other day, I've had crazy days on the 15th, total garbage days on the 20th, completely boring stuff on the 13th. Your brain loves making up stories, especially when there's a label like "unlucky number" - it just makes you more aware of coincidences on that day. If you actually start tracking your good and bad days honestly for a month or two, you'll pretty quickly see there's no pattern at all.

Personally, I've never really stressed about the 13, and when you look at the stats on accidents or serious stuff, Friday the 13th doesn't exactly blow the numbers out of the water. It's exactly what everyone else says: our brains are super good at spotting patterns and remembering coincidences that fit our beliefs, while forgetting thousands of 13s where nothing weird happened. It's pure psychology, not physics or curses.

But there's one thing nobody's brought up yet: the superstition around 13 also reinforces itself through real material and social consequences. Like, there are buildings in the United States that straight-up skip the 13th floor, or airlines that don't number the 13th row. That means people act differently on that day because they believe it's cursed, which can create actual real problems. You've got someone who's more stressed, sleeping badly, making weird decisions because they're thinking about it too much, and boom, problems show up - but it's not magical, it's just the effect of your own anxiety.

So it's neither pure stupid superstition nor a real danger: it's more of a fascinating example of how our beliefs can actually change our behavior and therefore our reality, without anything supernatural involved.

Most people just forget that the 13th comes 12 times a year like any other number, so statistically there's no reason it'd be worse. The thing that plays tricks on you is that if something bad happens on the 13th, your brain will highlight it and bring it back up for years, whereas an identical event on the 12th or 14th you'll completely forget about.

What matters more to you - is 13 *actually* bad or does it stress you out so much that you're extra careful that day? 😅 because honestly, that's what really plays a role. the 13 superstition has historical roots (the Last Supper, Friday the 13ths in Scandinavia) so it didn't come out of nowhere, but once it exists, it feeds itself - you stress more that day, you're less relaxed, so statistically you're more likely to mess up. it's not the number that's cursed, it's our anxiety showing up differently depending on whether we believe in it or not.

maxime_dubois asker Honestly, I don't stress about the 13. I did engineering for 40 years, no room for that stuff. But your question about the placebo effect, that's spot on.

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