I used to believe there was secret chamber in our history classroom called kamerlik, and there was monster living there, who whispered "My preciousss" whole the time.
I realized it was only my imagination as they removed rectangular board which always seemed to be entrance to the kamerlik to me, and I understood there was nothing but regular wall behind it.
A childhood belief about classes

others believed things like this
- I used to think the line in Pink Floyd's Another Brick in the Wall was "No dogs allowed in the classroom."— Gretchen
- I used to believe that a weegie board was some sort of surf board.— Missa
- I thought a Gas Chamber was just a place you went to put gas in your car!— Thais
- When I was young,I thought the lyrics "Secret Agent man" were actually "Secret Asian Man".— M.M.B.
- I used to think that board games were called bored games because you play them when you're bored.Anon
- I always used to think that grownups whispered where they wanted to go and the car went by itself!— Kay