You say these phrases all the time, but do you know their grim origins?

We toss around old sayings all the time—some without thinking twice. But have you ever wondered where these phrases actually came from? You might be surprised (and a little unsettled) to find out that many of them have pretty grim backstories. Even if we’re keeping things light and curious, you’ll never look at everyday expressions the same way again!

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The Mad Hatter may have been lovable and quirky in Alice in Wonderland, but the origin of the phrase isn’t nearly as charming. In the 18th and 19th centuries, hat-makers, especially in England, used mercury in the felt-making process. Long-term exposure to the toxic substance led to tremors, confusion, hallucinations, and even full-blown insanity. So, when someone was "mad as a hatter," it wasn’t a joke, it was actually a tragic side effect of their trade.

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These days, "deadline" means you’re rushing to finish your taxes or meet your grandson’s birthday RSVP. But during the Civil War, it was a deadly serious term. Prison camps had an actual line drawn in the dirt—step past it, and guards had permission to shoot without warning.

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If your grandkids ever run through your living room like a tornado, you’ve probably said they were "running amok." Originally, this referred to sudden, violent rampages by certain warriors in Southeast Asia. European colonizers didn’t understand it and blamed the devil, but it was likely tied to deep psychological distress. Over time, the phrase softened, but its origins are quite dark, don’t you think?

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It might sound like gentle teasing today, but "pulling someone’s leg" used to mean something far more sinister. In the crowded, foggy streets of old London, thieves would trip unsuspecting victims by yanking their legs from behind—either to rob them or help an accomplice mug them more easily. So next time someone says they’re "just pulling your leg," be glad it’s only a joke.

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You’ve probably said you were "taken aback" when someone shocked you with unexpected news, right? Did you know this phrase has nautical roots? On a sailing ship, if the wind hit the sails from the front, it could stop the boat dead in the water, or even pull it backwards. That "aback" feeling was equally surprising as it was alarming!

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We call fake emotions "crocodile tears," but the story behind it is a bit strange. People once believed crocodiles cried while eating their victims, like they were able to show some kind of twisted remorse. Of course, science has since debunked this theory, but the legend stuck around. So when someone puts on a sad face to get out of chores, just remember: even reptiles have better excuses.

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Before painkillers and numbing gels, wounded soldiers had one brutal option during surgery. Can you guess what it was? That’s right, bite the bullet. Literally. On the battlefield, doctors had to work fast and without anesthesia. A bullet between the teeth gave patients something to focus on while wounds were stitched (or worse!)

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We know that Shakespeare loved creating new words and phrases, and "the be-all and end-all" is one of his most dramatic. It first appeared in Macbeth when the title character thinks of ending the king’s life as a final, all-important solution. These days, we use it for less murderous things—like the ultimate plane has for some things.

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Saying "God bless you" after a sneeze might seem polite, but it stems from a much darker place. In the time of the bubonic plague, a sneeze could be an early symptom, and people feared it meant death was close. Saying "God bless you" was like a quick prayer that you’d survive. Other theories suggest it was meant to keep your soul from escaping. Whatever the origin, it was more panic than politeness.

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We say someone’s "wreaking havoc" when they’re causing trouble. But centuries ago, it was an actual military command. Once a battle was won, officers might yell "Havoc!" and soldiers were free to do and destroy whatever they wanted. As you can imagine, the chaos was so brutal that King Richard II officially banned the cry in the 14th century.

The truth about your brain

You won’t believe what happens in your brain while you sleep

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Your brain is one of the most powerful and mysterious organs in your body. It controls everything from your thoughts to your emotions and even processes information at lightning speed. But how much do you really know about it? Some long-believed myths about the brain have been debunked, while other surprising facts reveal just how incredible this organ truly is. Get ready to be amazed by these fascinating brain facts!

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You’ve probably heard this one before, but it’s completely false! While it’s true that not all parts of the brain fire at the same time, imaging studies show that most regions are active throughout the day, even when we sleep.

Your brain is constantly working, controlling bodily functions and emotions, and processing information. So next time someone says you’re only using 10% of your brain, you can confidently tell them that’s just a myth!

Image: Aarón Blanco Tejedor

Here’s a weird fact: While your brain processes pain signals from the rest of your body, it has no pain receptors of its own. This is why surgeons can perform brain surgery on conscious patients without causing them pain.

However, the membranes and tissues surrounding the brain do have pain receptors, which is why headaches and brain injuries can be so excruciating.

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How come we have headaches if the brain has no pain receptors? Well, that’s because headaches are triggered by chemical activity in the brain, changes in nerves and blood vessels, and even fluctuating serotonin levels.

In some cases, hormones like estrogen can also play a role, which explains why migraines are more common in women.

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Dreams are proof that your brain never rests! (Warning: this fact can make you feel exhausted.) While you sleep, your limbic system, that is, the part of the brain that deals with emotions, becomes especially active, which is why dreams often feel so intense.

On average, humans experience four to seven dreams per night, even if we don’t always remember them. And what about that scary nightmare about falling? Well, you can thank your amygdala, the brain’s fear center, for that one.

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Have you ever walked into a room and instantly forgotten what you were after? That’s because short-term memory only lasts about 20-30 seconds! That’s not enough!

Your brain holds a limited amount of information in its active state before deciding whether to store it or discard it. Ironically, we can’t really choose what makes the cut, but we do hope these facts stay with you!

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That sharp, icy pain when you eat something too cold? It’s your brain’s way of telling you to slow down! Officially called sphenopalatine ganglioneuralgia, a brain freeze happens when cold food or drinks rapidly chill the blood vessels in your throat, causing them to constrict and then rapidly expand. This sends pain signals to your brain, warning you of the sudden temperature shift. It’s annoying, but it’s actually your body trying to protect itself!

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You didn’t need us to tell you, but let’s look at the details: The average person has between 12,000 and 60,000 thoughts per day. What’s even more interesting? 95% of those thoughts are the same ones you had yesterday. Is that not surprising enough? Hear this out: 80% of them tend to be negative. That’s because our brains are wired for survival, constantly analyzing risks and potential dangers.

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Even though it only makes up about 2% of your body weight, your brain employs a major quantity of energy! It consumes 20% of your oxygen and blood supply, making it one of the most demanding organs in your body.

If your brain goes without oxygen for just five minutes, brain cells start dying, leading to irreversible damage. This is why deep breathing and cardiovascular exercise are great for brain health!

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Do you know that feeling when you hit the back of your head and see stars? That’s because your occipital lobe, which controls vision, is located at the back of your brain. If you get hit there, your brain momentarily misfires, causing flashes of light.

Interestingly, your brain processes vision on the opposite side; while your right brain controls your left eye, your left brain controls your right eye. It’s one of the many ways the brain operates in a complex way.

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Believe it or not, your brain generates between 12 and 25 watts of electricity when you’re awake. If you can’t really grasp how powerful that is, check this out: It’s enough to power a small light bulb! Your brain’s electrical activity is what allows neurons to send signals at speeds of up to 260 miles per hour.

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Your brain may be the fattiest organ in your body, consisting of at least 60% fat! This is why consuming healthy fats, like omega-3s and omega-6s present in fish, for example, is essential for brain health.

Healthy fats stabilize brain cell walls, reduce inflammation, and support cognitive function. So go ahead and enjoy that avocado toast, it’s food for your brain!

Image: Robina Weermeijer

It’s not just your memory that fades over time; the brain itself physically shrinks as one gets older. It continues developing until your late 40s, but after that, it slowly decreases in size.

Now, size doesn’t equal intelligence, so a smaller brain doesn’t necessarily mean a less capable one. Staying mentally active, exercising, and eating brain-boosting foods can help keep it in top shape!

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We often think of cholesterol as bad, but your brain actually depends on it! In fact, 25% of your body’s cholesterol is stored in your brain, where it helps with learning and memory. However, unlike other organs, the brain can’t absorb cholesterol from the blood, it has to produce its own. So, while too much cholesterol in the body can be harmful, the right amount is vital for brain function. At least you can use that as an excuse to get that burger!