I used to believe that everyone in Russia (back when it was The USSR) had to write a letter to the president for permission to do anything. This also included writing a letter to the president asking for permission to do something, so I thought the president would come to the house of anyone who wrote him a letter and arrest them for writing a letter without permission.
I don't know how I thought anyone got anything done, I didn't think that far.
A childhood belief about places

others believed things like this
- We didn't have a chimney in our house. Father Christmas had to come in through the letter box.— Ginnean
- I used to believe that at Christmas if your house never had a chimney then santa came through your letter box— Rhys James
- In preschool, I thought that the letter N came twice in the alphabet- W X Y N ZAnon
- i really thought that "key" was a secret letter to the alphabet that only i knew.— amber
- My friend Chris told me that when he was young, he thought that "elemeno" was the letter between k and p.— Jocelyn666
- I always thought that a little person lived inside each mailbox waiting to take my letter to its destination.— Anne