Every year, millions of people lean over a cake, stare at a handful of candles, and make a silent wish before blowing them out. But why — why candles, why wishes, why a cake shaped like the moon?
If you stop to think about it long enough, you’d end up in ancient Greece, where people baked round cakes for Artemis, the goddess of the moon, and lit candles on top so the offering would glow like moonlight. The smoke rising from the flames was thought to carry prayers up to the gods. What we now call a birthday wish is, essentially, a very old religious ritual performed over dessert.
Traditions often feel very ordinary right up until the moment you poke at them, and then they turn out to be genuinely bizarre.
Take the handshake — something done hundreds of millions of times a day, often without much thought. It began as a peace gesture in ancient times. Extending your right hand, palm open, showed that you weren’t holding a weapon. Pumping it up and down was meant to dislodge anything hidden in the sleeve. The entire custom is built around the assumption that the other person might be armed. We’ve been greeting each other with an elaborate “I promise I’m not about to stab you” for roughly 2,500 years. Fun!
Knocking on wood goes back to a widespread belief, shared across many early European cultures, that spirits lived inside trees. Rapping on wood was a way to wake them up and ask for protection, or to say thank you when something went well. Over time the specific spiritual reasoning got lost, but the physical habit stayed. People now do it on plastic tables. The spirits, presumably, are unmoved.
Crossing your fingers works the same way. It’s thought to have started as a secret sign among early Christians, who used crossed fingers (representing the cross) when asking for protection. Two people might cross their fingers together as a private signal of shared faith. Somewhere along the way, the gesture became a solo act for wishing on test scores and football results.
The “bless you” people say when someone sneezes is older still, and the reasoning behind it has shifted several times. The ancient Romans believed a sneeze could expel your soul briefly from your body, leaving it vulnerable. Pope Gregory I encouraged people to say a prayer for sneezers during the plague of 590 AD, when a sneeze was a very plausible early symptom of something fatal. The blessing stuck even after the danger it was designed for disappeared. These days it’s mostly just what you say, though the biological reality, that a sneeze briefly closes your eyes and sends particles flying at up to 160 kilometres per hour, is alarming enough on its own.
Weddings carry an especially dense collection of inherited customs. The ring on the left fourth finger comes from a Roman belief in a vein called the vena amoris (the “vein of love”) said to run directly from that finger to the heart. The vein doesn’t actually exist, which anatomists confirmed some time ago, but that’s never stopped anyone from wearing a ring there. Throwing rice at a newly married couple is even older, an ancient practice in several cultures of showering people with seeds and grain to wish them abundance and fertility. Many venues have banned rice in recent years (it can be slippery and hard on birds who eat it), so flower petals and soap bubbles have become common substitutes. The symbolic meaning remained, but the projectile changed.
The clinking of glasses before drinking is harder to pin down definitively, though two theories have followed it through history. One is practical: sloshing drinks together was a way to mix the contents between cups, which would be a fairly effective poison deterrent if each person had already added something to their own glass. The second is more philosophical, that sharing a drink should engage all five senses, and without that clink, the ears are left out. Both stories are plausible; neither can be fully proven, and neither matters at a birthday dinner.
Coins in fountains started with much more pressing concerns. Ancient Europeans believed that wells, springs, and water sources were watched over by spirits or minor gods. Tossing in a coin was an offering, a way to stay on good terms with whatever was down there, ideally in exchange for health, safe travel, or a decent harvest. The Trevi Fountain in Rome now collects over a million euros in coins annually, which are donated to a food bank. The spirits have been replaced by charity, which seems like an improvement.
April Fools’ Day is genuinely mysterious in its origins, and historians have been arguing about it for centuries. The most commonly cited theory involves calendar reform — in 1564, France switched to the Gregorian calendar, moving New Year’s from around April 1st to January 1st. People who hadn’t heard about the change, or who stubbornly kept celebrating in April, were called “April fools” and sometimes had paper fish stuck to their backs (a tradition that survives in France as poisson d’avril). But references to April foolishness predate this by decades, so the calendar story may be a later explanation rather than the true origin. It’s possible that April Fools’ Day, one of the world’s most widely observed traditions, has no clean origin story at all.
Wishing on a shooting star is a good example of how ancient observations became superstition, which became habit. Greek philosophers believed the stars were occasionally moved aside by the gods to take a peek at the world below, and that a wish made during that brief window had a decent chance of being heard. Given that shooting stars are actually tiny pieces of rock and debris burning up in the atmosphere at speeds of around 70 kilometres per second, the gods-peeking-through theory has not aged well. The wishes continue regardless.
The 11:11 wish is the newest entry in this list by a long stretch, and the least historically grounded. The idea that repeating numbers signal good fortune drifted in through New Age thinking in the late 20th century and then spread rapidly once people had phones in their pockets showing them the time every few minutes. There’s no ancient text behind it, no ritual it evolved from — it’s essentially a superstition that was born online and spread faster than any of the others because the mechanism for noticing it (a digital clock) is something billions of people check dozens of times a day. Whether that makes it less legitimate than wishing on a burning piece of space rock is a reasonable question.
What all of these traditions have in common is that they’ve long since been separated from whatever originally gave them meaning. The gestures persist because they’re embedded in daily life, because they feel connected to something larger, and because, practically speaking, nobody’s in a rush to stop doing them. Traditions don’t usually survive because they’re true. They survive because they’re useful, comforting, or simply enjoyable, and because each generation teaches the next one without ever fully explaining why.
