When I was little, my Mum told me that any food we didn't eat at dinner went to a place called Leftover Land. (Later questioning, after I saw that it in fact was spooned into the bin, revealed that a wizard comes and removes it from the bin before transporting it to Leftover Land.)
She threatened that one day she was going to take us to Leftover Land, where we'd have to eat, finally, all of our associated leftovers.
I sometimes left behind the parts of the meal I liked best, so that when she finally took me I'd be able to have a good time.
A childhood belief about general

others believed things like this
- My brother once convinced me that the wind was "leftover hurricanes"— Tufty the Squirrel
- I used to think that
"The land of make believe"
was
"The land of baked beans."— Baked Bean! - I used to think that Spongebob took place on LAND.— Eeveelover8632
- I thought the England was EDGE-land but england was ENG-landAnon
- I used to believe that Finland was in the end of the world. Fin-land.— Francesco Delvecchio, Roma/Italia
- i used to believe that 'island' was pronounced 'is-land' instead. I know im not alone on that one! :)
— Da KornMeal