Because of Beauty and the Beast, I thought that "provincial" meant "boring" because she sings, "I want much more than this provincial life!".
It also made me think "primeval" meant "prime evil", e.g really bad, because Belle uses that word to describe Gaston.
A childhood belief about speaking

others believed things like this
- When I was about 5 or 6, I used to think the song 'Beauty and the Beast' was really 'Beauty and the Beef'.— Natski
- I used to believe that "nuptial" was a naughty word. I thought it meant nipple. XD— Sara Hagen
- For years I heard the word "pedophile" and thought it meant a pedicurist's tool.— Lauren
- my husband believed, until recently, that the word "several" meant seven of something. — sheryl
- i used to think the word "friendship" meant a special kind of rocketship that you went on with your friends.— chips ahoy!
- I fully believed, up until about 6 years old, that the word 'accident' was a noun that meant 'burnt toast'.— Karl Goetz