When I was extremely young, I used to think that if you got on the "A" or "B" honor roll, it meant you'd written an essay where every single word began with an "A" and that was how you got on the honor roll. Same thing with "B" honor rolls.
A childhood belief about classes

others believed things like this
- all people who smoke roll up cigarettes have been to prison— spam
- I thought Rock and Roll were 2 musicians, with one who rocked and one who rolled.Anon
- I thought that the song "Built this City" by starship went as follows. "Milk and Cereal, Rock and Roll"Anon
- I used to believe that you spelled "ESSAY" like "SA" and "EASY" like "EZ".— Lauren
- my husband believed, until recently, that the word "several" meant seven of something. — sheryl
- I used to believe that "nuptial" was a naughty word. I thought it meant nipple. XD— Sara Hagen