I used to believe that there were only two years: 1990, and 1991. They just cycled, over and over. I remember one time my teacher asked me what year it would be next year, and I promptly responded "1990!" (it was 1991 at the time, of course). Everyone in the class laughed at me and the teacher looked at me like I had drank stupid juice that morning, or something.
A childhood belief about general

others believed things like this
- I always thought that after 1999 it would be 1990 again, but with different months and days of the week
— optional - I got the 1990s and 1900s mixed up, so I thought people wore that fancy old-fashioned garb in the 1990's.Anon
- When I was in elementary school I use to think that teacher lived at school at their desks all year long.Anon
- I used to think my elementary school gym teacher's name was "Jim Class".— Brandon Campbell
- When I was in kindergarten, I used to believe that they locked the teacher's in the teacher's lounge at night.Anon
- I once asked my CCD teacher if eternal bliss in Heaven would get boring after a while.— Some Dude With A Name