I used to believe that the road sign "Slow Children Ahead" meant that there were mentally challenged children living in the neighborhood.
A childhood belief about road signs

others believed things like this
- I thought being mentally challenged meant you couldn't do any challenges with peopleAnon
- I was convinced that children weren't humans, only adults were, children were a total different race!— Leda
- I used to think Kenny Rogers had 400 children and a crop in the field. Rather than 4 hungry children.Anon
- My daddy used to think that there was a children-police that killed children who was bad— jonnie
- I thought for the longest time that a No Standing traffic sign meant no person should stand near that sign.— Shannon
- I used to think that only grown ups were "people".Children to me were no people ,they were just children.— Minny