When my Dad was young he thought that when you studied English at school, it was just the name for your own language. So when French people studied French, they called it English.
A childhood belief about foreign languages

others believed things like this
- i used to think that french was english backwards!— ---pepsi---
- I used to believe that, no matter what language other people spoke, that everyone thought in EnglishAnon
- I used to think that even people who spoke something other than English, thought in English— Peaches
- I used to believe that french kiss was something coming from France, and that only the French did it— Sasha
- I used to think that you had to be french to really taste french fries.— Not French;)
- I used to believe that the whole world spoke the same language- English.Anon