I used to believe that Santa had twelve elf helpers: no more no less. This was extremely important to the balance of the world, and why the number "13" is considered unlucky. If Santa got another helper, the whole world would become out of whack and would spiral into a world of chaos and destruction! I still partly believe it today :)
A childhood belief about father christmas

others believed things like this
- I thought the world was black and white because of all the smoke from the bombs in Second World War.— Bjoern
- i used to belive that 100 was the biggest number in the world "i got at least a hundred marbles."— dan harris
- 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 . ]