I pronounced "adolescent" as uh-DOLE-sent once and my mother cracked up after figuring out what I was saying.
Also around this same time in my life, I pronounced "adirondack" as uh-DEAR-on-dack. Mom again got a good laugh. However, while at my condo complex's pool this summer, I heard a woman in her 30s pronounce the word the same way. I felt superior, as I had learned the proper pronunciation years ago.
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
- When I was little i thought lb for pounds was pronounced lubs, and i called them that for 2 years. Anon
- i used to believe that 'island' was pronounced 'is-land' instead. I know im not alone on that one! :)
— Da KornMeal - I used to think that New York was pronounced "Yew Nork"Anon