A few years ago my teacher said that his daughter thought that 20, 21, 22 etc. were pronounced "two-ty, two-ty one, two-ty two" and so on.
A childhood belief about counting

others believed things like this
- When I was little i thought lb for pounds was pronounced lubs, and i called them that for 2 years. Anon
- 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
- I thought that polystyrene was pronounced 'polly-STEE-LEE-an'.— Polly Stairiin
- I thought that Job in the Bible was pronounced "Jawb" and that it had something to do with Steve Jobs.Anon
- im grade 2, my teacher said that she was 2000 years old and i belived her— ---pepsi---