I used to believe adjacent was pronounced add-juh-sent, the a making the uh sound like in the word uh. Then when I heard adjacent I thought I heard ajason, so I've pronounced adjacent over three different ways before learning the correct pronounciation.
A childhood belief about speaking

others believed things like this
- When I was young I used to think that WHSmith was all one word, and was thus pronounced "Wwwhhhhuuusmith"— Nathan
- I used to believe that the word 'circumstances' was pronounced 'circus dancers'.— Mel
- When i first saw the word "Czech" somewhere, i pronounced it "siz-ETCH" in my head — Pachisu
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny
- i thought the name Anon, was really a name...pronounced A-Non...haha i figured it out— Norman einstien
- Until very recently, I thought "archives" was pronounced like "are chives".— Mitsuki