Warding off evil spirits
Do you refuse to walk under a ladder? Here's why!
Published on May 15, 2025
Credit: Ellie Burgin
Many of our most enduring superstitions —such as refraining from stepping under a ladder or avoiding spilling salt— date back centuries. Many have to do with religion, while others we have borrowed from ancient cultures’ traditions. Yet, almost all of them have in common the need to prevent bad fortune or, on the contrary, to attract good luck. In this article, we have compiled 12 popular superstitions and their respective origins. You probably already follow many of them, but do you know the fascinating stories behind them?
Number 13
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Did you know that many buildings don't have a 13th floor, and many hotels skip rooms ending in 13? This is a superstition deeply rooted in Western culture! The bad reputation of the number 13 is at odds with the lucky number 12, which represents wholeness: the number of months of the year, the gods of Olympus, the signs of the zodiac, etc.
The number 13, on the other hand, is associated with a legend from Norse mythology. Loki, a shape-shifter god, was the thirteenth to arrive at a party, where he tricked another guest into killing the god Baldur. Does this story sound familiar? For Christianity, the apostle who betrayed Jesus, Judas, was the thirteenth guest at the Last Supper.
Black cats
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While felines were considered sacred animals in civilizations such as Ancient Egypt, in the Middle Ages, black cats began to be associated with witches.
During the time of the European Inquisition, many women were accused of practicing witchcraft, and their black feline companions suffered the same fate. The belief that black cats were the incarnation of witches and that crossing paths with one brought bad luck reached the United States at the time of the Salem witch trials.
Walking under ladders
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We are all afraid to walk under a ladder, but very few know the origin of this superstition that extends across several cultures. For Christianity, anything in the shape of a triangle symbolizes the Holy Trinity. If you walk under a triangle-shaped ladder, you would be profaning the sacred and invoking the devil.
In medieval times, in turn, the space below an open ladder was associated with the bottom of the gallows. Thus, it was believed that a person who made the mistake of walking under a ladder would face their own death by hanging in the near future.
Opening umbrellas inside
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Some believe this superstition is ancient, dating back to the Egyptians, no less! As far as we know, in the Land of the Pharaohs, it was very common to use parasols to protect from the sun, but opening them indoors was considered an insult to the Sun God.
Another theory claims that our belief that opening an umbrella indoors brings bad luck originated in Victorian England. At the time, modern mechanical umbrellas began to become popular, and people considered it too dangerous to open them indoors. Pretty common sense, don't you think?
Rabbit’s foot
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The idea that rabbits bring good luck is probably rooted in Celtic folklore. They believed that since rabbits live underground, they have a direct line of communication with the gods.
In more recent times, the animal's reputation for fertility made rabbit amulets popular among women hoping to conceive. Most rabbit's foot amulets today are made of fake fur and plastic, yet the superstition is as alive as ever.
Throwing salt
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There are at least two theories that explain why spilling salt brings bad luck. In ancient civilizations such as Sumerian, Egyptian, and Greek, salt was an extremely expensive and coveted commodity, so spilling it was a huge waste.
The other theory states that salt was considered a magical substance used to perform rituals. Spilling it meant the devil was invited in. Luckily, if you make the mistake of spilling some salt, there is a way to nullify the bad luck: just throw a pinch over your left shoulder to scare away the bad spirits!
"God bless" a sneeze
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In most English-speaking countries, it is almost an unconscious reflex to bless someone when they sneeze. Some believe this custom has its origin in an ancient superstition: the soul is separated from the body when we sneeze.
However, the most accurate theory states that this tradition began in the sixth century A.D. when a deadly disease began to spread through Italy. Pope Gregory the Great instructed people to pray for the sick when they sneezed with a simple but, according to him, infallible plea, "God bless you!"
Breaking mirrors
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According to this popular belief, breaking a mirror brings seven years of bad luck. But why seven and not six or eight? Believe it or not, there’s an explanation!
For one, in ancient times, the mirror was considered a literal reflection of the soul. This, added to the Roman myth that our body is "renewed" every seven years, fed the superstition that breaking a mirror means condemning your soul to seven years of bad luck.
Horseshoes
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Horseshoes are a classic symbol of good luck. But do you know where the tradition comes from? It originated in a Christian story about a 10th-century saint. According to legend, Dunstan was a blacksmith who one day was asked by the deceiving Devil to shoe his horse. The clever Dunstan, however, saw through the disguise and nailed the shoe to the Devil's foot instead.
The blacksmith finally agreed to remove the painful nails only if the Devil promised never to enter a house with a horseshoe hanging on the doorway. Still today, it is customary to hang a horseshoe with seven nails over the door to protect houses, barns, and stables from evil spirits.
Four-leaf clovers
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In the rich tapestry of symbols created by humans throughout history, few are as universal as the four-leaf clover. This rare variant of the common clover has transcended its botanical virtues to become an emblem of good luck.
The tradition of the four-leaf clover dates back to antiquity. Druids, the high-ranking professional class in ancient Celtic cultures, considered them powerful amulets capable of warding off evil spirits and bringing good luck. The difficulty of finding one in the wild —an estimated 1 in 5,000— probably contributed to its mystique and value as an amulet.
Knocking on wood
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Knocking on wood to prevent disappointment is a very popular superstition in the United States. However, it has its origins in the ancient pagans who believed that spirits lived in trees. To invoke them and ask for protection, they would knock on the trunks. The ritual was also performed to thank them when something good happened.
Other cultures later adopted the tradition. Some Christians associated the gesture with the rite of touching a crucifix when taking an oath, while Jews connected it to knocking on the wooden doors of synagogues when seeking refuge during the Spanish Inquisition.
Groundhog Day
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The custom of predicting the weather through animals was adapted from German culture. In the ancient tradition of Candlemas, celebrated on February 2, members of the clergy distributed blessed candles that were used to determine how long the winter would last.
In the same way, Germans also kept track of the hibernation time of animals. They used to closely follow badgers, but when settlers came to the United States and chose Pennsylvania as their home, they found groundhogs to be a better option.