I thought Airheads candy made you feel lightheaded when you ate it. I don't even know why, probably from the commercials where kids heads turned into balloons. Definite placebo effect on me too, from what I remember. I really "felt" it.
I legit thought Airheads were as elastic and stretchy as portrayed on the commercials, like an edible gum. I was convinced to stretch them out as I bit into them, only to find they degrade into a sugary paste. The flavor and the crunchy chewy consistency helped otherwise.
I thought anime and video games were only created in the US because animators were paid by Japan and other nations to make cartoons and video games, and that the whole aesthetic, including schools and modern settings was made in the US as well, because other nations would only draw things specifically as to their own ethnicity or had severe restrictions; seriously, I thought Japan and the rest of Asia only drew slanted eyes and like ukiyo-e or traditional art, and they all lived like olden times, unless they came overseas to learn in the States and work in America. I also thought anime was popular overseas but underground with a cult following locally because of their supposed intended overseas appeal and commission, and Toonami and Pokemon was started to host these commissions to compete with Nickelodeon and MTV.
For some reason, I had an immense fear of Japan growing up. Probably because I grew up hearing about WWII and how they were one of the enemies, I thought they were pacified but still active enemies awaiting the day they could take over and attack the US again if the US stopped allowing them to work. Because I grew up going to church as a child, I also misinterpreted Shinto as Satanism glancing at a page in a book because of this stigma, lol.
When I read at a young age, I learned that Japan served fugu, and because I heard it was a poisonous fish and with the help of The Simpsons, I was paranoid to think that sushi restaurants openly served fugu as a compliment. Thankfully my eldest brother's college graduation and a local Japanese friend who ran a sushi bar in the college town helped dispel a lot of this stuff. He's doing great these days too.
I also believed China was the major nation of East Asia like an Eastern USA, and that it was peaceful and tranquil and was the real Asian nation that had wealth, while Japan was on the bottom because of World War II. How wrong I was. Man I am laughing like an idiot. I also had a really bad case of thinking the world was black and white in morality back then too, and that the US was the only good nation that made a stand in leading the world to not constantly wage war on each other.
The town I grew up in also was a neat place where the elementary schools were really nice and up to date, and they had years with themes to learn about along with the general curriculum, like an environmental year or a world ethnicity year. I thought that the world would had been as openminded as the school would be. Well, at least I learned more from school at that point in my life on an ethical scale than anything after that.
I also thought that superheroes were celebrated gloriously if they had an animated series, so when Justice League got aired, I thought it was a huge nationwide premiere like a cartoon primetime. I was half right, still better than anything later live action later on.
I used to think that there would be a day when the world's gravity would stop working, and we'd all have to learn to walk on the ceilings and adapt to life literally upside down, or else we'd fall endlessly through the sky like a bottomless pit. I also believed that the end of the world would happened in the year 2000, and because I didn't pay attention, I had this phase later in December. It wouldn't be bad though, as the thought included everyone being sent up into space in colonies and we'd all find a new planet or something like in Titan AE.
I also didn't understand how microwaves worked, and I thought they worked like slow cooker/air fryer ovens like today. When I was four years old, I put in a McDonald's hamburger in the microwave and set it for 20 minutes. That shit caught fire and I was taught to never use the microwave until I was older. Then I used the microwave at 10 to reheat some beef and I destroyed the stovetop microwave because that also caught fire. It's funny how life works.
I had the obvious fear that basements had monsters in them, and specifically zombies, because they'd crawl through the earth into your house. While some houses we had never felt off, there was one that scared me the most, and it was a house where the basement would only meet halfway while there'd be a lone narrow room with one side of it a cement cinder block wall that was only partially finished, and you could see the hole, which was nothing but pitch black. I honestly thought that was a mausloeum where zombies would crawl out of or a place where the previous owner was a psychopath and hid his victim's bodies in there.