Einstein said that if you move close to the speed of light, you'll go forward in time. Therefore, I thought, if you go backwards at close to the speed of light, you'll go backwards in time.

I was like 6 years old when my dad randomly told me that if a player dies during a football game, the others players have to eat him before the game can continue.

I never watched sports so I didn't even question it lol

That if we didn't have enough money we could just go to the ATM and get more.

Also, when I was very young, I apparently spent too long in the toilet once and one of my parents (don't recall which) asked me if I'd fallen down the hole.
It took me shitting myself at school months later for them to find out that I'd been terrified of falling into the toilet (and avoiding using it as much and for as long as I could, or, in that particular occasion, longer) since that day.
(I was small but not that small, obviously, but kids can be surprisingly dumb for how surprisingly smart they are.)

I do not know where I got this from, but I thought all dogs were male and all cats were female. I thought this while I had a dog named Betsy and a cat named Sebastian.

If that's not bad enough on its own, I think I was in first or second grade when I learned the surprising truth. I wasn't a dumb kid, either. I learned to read when I was about 3.5 yrs old and started 1st grade as a 5 yr old.

I'm now in my 70s and I still can't figure out where I got that from!

You can accomplish anything if you put your mind to it and try hard enough.

I used to believe that if you just work hard you'll get ahead in life

I always thought cigarettes contain tar, as in the substance asphalt on the road is made from. It always felt weird to me, why would they put it in the cigarettes but I figured maybe they need it so the tobacco doesn't fall out or something.

That the Mormon god was totally real

Ass cheeks were shit tanks.

That god(s) exist(s).

Trees make wind because whenever there was wind, they moved.

Old people were always old

That my parents knew what they were doing, made good choices, and were reasonable people.

No, no, ... and no.

That I'd grow up to eat candy, collect baseball cards, play video games, and read comic books.

No (type II diabetes runs in my family), no (wtf is a baseball card anyway), no (video games were replaced with homework permanently), and — well, actually — yes.

I love a good comic book, graphic novel, and/or animated series.

That my family cared about me and supported me.

When I was six years old or so, my sister called me a "cosweb" and told me it was the worst thing ever. I completely believed her for a long time.

The crust on bread had more nutrients than the center. My dad didn’t want to cut my crusts off lol.

My uncle always swapped the words breast and best so my cousin mixes them up sometimes to this day. He said ‘breast friend’ at his brother’s wedding