I used to believe (until 2 years ago, I'm 25) that the word excavator was pronounced "ex-cav-a-gat-or". I have other words I could never pronounce right either. My family still makes fun of me...
A childhood belief about speaking

others believed things like this
- I used to pronounce the word "Computer" as "Crocuta"
Anon - 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
- I thought the word economical was actually two words: eek and omical.
— Nancy M. - I used to believe that the words Angliphile and Francophile were related to the word paedophiles.Anon