I used to get "jaw" confused with "palm."
When I was about twelve or thirteen, my mother was reading me The Odyssey, and at one point, Queen Penelope has these men who want to marry her because they think Odysseus is dead, and they say, "We'll draw lots". I didn't know what that meant, so I thought it meant they'd draw (as in sketch) a lot of Odysseuses.
I learned about opposites from Sesame Street and naturally assumed EVERYTHING in the world had to have an opposite. Spanish was the opposite of English, the sun was the opposite of the moon, candy was the opposite of vegetables, recess was the opposite of classtime, rollerblades were the opposite of bicycles, and cats were the opposite of dogs.
I used to believe that "sue" meant murder, so in movies when someone is getting sued I got really confused
I used to believe when you'd see a company sign that says "Est. 1928” it meant they estimated the company was founded in 1928. I always wondered why some companies had to estimate when they were only a few years old. Much later I realized est stands for "established" and not "estimated".
I used to think that the word "adjacent" was pronounced "add jassent"
When I was about 5 years old, I thought that "Scarlatti" was a type of Italian pasta, sort of like spaghetti or noodles.
I first saw the word "Lisztomania" in a "grown-up"(a book that doesn't have many pictures) book I was reading at the library as a kid. I didn't know what it meant at the time, so I assumed it was a country or a type of dance or something like that...
I used to think that oxymoron had something to do with oxygen...
Until I was in 4th grade i thought choir was pronounced "chore"
I thought the British town Reading was pronounced "Reeding" instead of "Redding".
When I was five years old, my mom had a copy of a book titled "What Was Good About Today?" I thought the title meant that "Good" was the name of a TV show and that the author was asking what that day's episode was about.
There's a Captain Underpants book in which the heroes put the title character under a placebo effect, which they misidentify as a "placenta effect". I had heard of the concept, but the joke went over my head, and for years I referred to the phenomenon as "the placenta effect".
I once saw the phrase "infrared light" in a physics book I had. I thought the light has been infrared, as if "to infrare" (pronounce inf-rare) was a verb.
One of my big sister's friends was reading a "Choose Your Own Adventure" book. I was afraid of it because I believed if you read it, you would actually be transformed into an animal.
When I first saw Highlights magazine, I used to believe that the slogan "Fun with a Purpose" was actually "Fun with a Person", and meant that Highlights should only be read with other people. I always read it alone anyway...
Reading the newspaper one day I came across the word rape. I asked my father what it meant. He replied to me that it was a sort of a salt. His manner didn't invite further questions. It was not until many years later that I understood that he had said assault.
In first grade, I thought that if I've never heard of a word before, then it wasn't a word.
I used to live in Florida, so I used to believe the FL OZ measurements on drinks and shampoo were FLORIDA ounces, and each state had its own unit for measuring liquid.
My mom bought me a Guinness Book of World Records when I was 8 and I loved reading it because I thought it would make me a genius. Why did I think that? Well, I didn't know what "Guinness" was nor how it was pronounced, so I assumed it was called the "Genius's Book of World Records"!