I used to think that when you saw a children's stairgate in somebody's house, it meant there was something fun upstairs, like a playground or toyshop, and was rather disappointed to realize that it was just to prevent toddlers from falling down the stairs, although I must have used one myself, although I don't remember!
A childhood belief about around the house

others believed things like this
- The lollypop man's job was to give children lollypops.
How disappointed I was when I met one. :DAnon - I used to believe that if you were naughty at school then you'd have to go upstairs and sit on your bed!— Eve
- I used to believe my dentist could give me a shot to straighten my teeth and prevent cavities.— sircigar
- I was convinced that children weren't humans, only adults were, children were a total different race!— Leda
- Whenever I was upstairs on a bus, I didn't believe that it would fit under the bridge so I used to duck. — Dave, Lancashire
- I used to think Kenny Rogers had 400 children and a crop in the field. Rather than 4 hungry children.Anon