I used to think there was a difference between "the whole world" and "the whole wide world" -- the latter being, of course, wider. My cousins had a globe in their house which I understood to be a picture of "the whole world". I figured "the whole wide world" must look like the globe with a kind of small house or cabin attached to it at about the equator.
A childhood belief about places

others believed things like this
- When my dad was young,he used to believe that the lines on a globe were on the world itself.— LINE MACHINES!
- I thought the world was black and white because of all the smoke from the bombs in Second World War.— Bjoern
- Until a few years ago, I believed this was a "doggy dog" world, rather than a "dog-eat-dog" world.— jemima
- I used to think that the phrase "It's a dog eat dog world'' was its a dogey dog world.— Gabral
- I used to believe that we lived inside of the world. I asked my Dad who lived on the outside of the world. — Pauline
- I used to think a world record was a record of all the people in the world singing .— JACK REGAN . [SWEENEY . ]