I used to think that the book Harry Potter and the Order of the Phoenix was Harry Potter and the Order of the Penis
A childhood belief about spelling

others believed things like this
- i used to believe Harry Potter was real— charlotte
- I used to believe that Hitler's first name was Harry.— Paul
- My uncle harry has a very long beard and a hariy face. I used to think he was a wizard.Anon
- Oasis - Don't Look Back In Anger
"Oh, Harry can't mate
He knows it's too late
As he's stalking, oh my..."— Santa Puncher - I used to believe the show Law and Order was a gardening show called Lawn and Order.— Adriana
- I thought in order to smoke a cigarret, you had to eat it!— Zoe