I thought the word "melodramatic" was actually "mellow-dramatic", and thought it was a really dumb word since it was basically an oxymoron (how can something be mellow and dramatic at the same time?)
A childhood belief about speaking

others believed things like this
- I thought the word mailman was male man and it seemed dumb to me as aren't all men male?— andalite
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny
- When I was young, I heard the word 'minion' for the first time and thought it was a miniature onion.— Karin
- I used to think the word fever was just another word for giraff— Marshall m
- When I was a kid, I used to think that an oxymoron was a stupid ox.— Froogle
- I used to think that oxymoron had something to do with oxygen...Anon