I used to think that the WH Smiths bookstores were pronounced 'Wuh Huh Smith'. To this day, I still get teased about it.
A childhood belief about going shopping

others believed things like this
- I used to believe that Will Smith's name wasn't Will Smith, but that it was World Smith.— Scott
- I used to think "Aero Smith" was only one person.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
- when i was little i used to think bumble bee was actually pronounced bumbow bee— cathy
- I used to believe that L-M-N-O-P was 1 letter, pronounced elemenopeeAnon