When I was little I thought people that spoke foreign languages made it up as they went along, because it seemed no one ever understood them other than the people they knew. There was a monolingual Spanish kid in my preschool class and, based on this belief, went over and started trying to talk to him in gibberish. I'm sure the adults thought it was sweet, but that kid probably thought I was crazy after that...
A childhood belief about foreign languages

others believed things like this
- I thought that people who spoke a different languages were aliens.— Phoebe
- I used to believe that people who were speaking foreighn languages were just speaking gibberish.— Zoe
- Until about 2nd grade, I thought they spoke Spanish in China.Anon
- When i was little i thought that people could laugh in different languages— Lauren
- I heard my mum talking about foreign people, and I later asked, "have you ever been to Foreign?"— Kia
- I used to believe that, no matter what language other people spoke, that everyone thought in EnglishAnon