I grew up in a small town and our Elementary School was one floor (of classrooms) and then had about 15 steps down to a gymnasium. I remember every day that we had Gym class (right up until we left for High School in grade 7) EVERYBODY would skip the third stair from the bottom because it was grey and all the rest were red... the "big kids" told us when we were in kindergarten that if we stepped on the grey step, a monster would kill us the next time we were alone...I remember every time I had to go to the bathroom I would RUN to it, because the stairs to the Gym were right next to the bathroom...and I'd pray the whole time.
So a couple of years ago, I was laying on a boat with a friend of mine (I think I was in grade 11 or 12 and he had been graduated for 4 or 5 years) and we were talking about how much we missed being kids...and he brought up the grey stair! I thought it was funny that EVERYBODY that went to school there knew about it and were scared because it had been passed down for so long.
(I still skip the third stair when I visit the school)
A childhood belief about classes

others believed things like this
- When I was in elementary school I use to think that teacher lived at school at their desks all year long.Anon
- I didn't quite grasp the concept of time zones, and thought that Chinese kids went to school at night.— Giselle
- When I was in elementary school nuns cam to our school. I thought that 'nun' meant they had no religion.Anon
- When I was a kid, I believed that bible school was "beauty school", and called it that all the time.— Dana
- I used to think that girls' anuses were green. I remember thinking that as late as high school.— Jack
- I thought that wars had to last four years... just like high school and college.— A. Falk