When listening to CasyKasem on America's Top 40 while growing up, I thought he always talked about such-and-such band's 'day view' album. It wasn't until my 9th grade English class that I learned d-e-b-u-t was not pronounce dee-BUTT, but in fact day-BEW, and that it wasn't a 'day view album' but a 'debut album.'
Ugh.
A childhood belief about speaking

others believed things like this
- i used to belive that pay-per-view was paper view.— matt b.
- We had a male cat that wasn't neutered. I thought his testicles were just the cat version of a butt.— Robyn
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny
- I used to believe all of North America was Canada and South America was USA..— Daria
- I used to think that even people who spoke something other than English, thought in English— Peaches
- I thought when I wasn't looking my dog would disco.
don't ask.— Fred