This isn't my own childhood belief, but a good friend of mine's. For some strange reason he developped this belief that if you flew to Australia then the plane turned upside-down, and this would somehow mean that when you got there that gravity would be inverted. He firmly believes that all Australians have to wear magnetic shoes so that they don't fall off the earth, and that some sort of special cling film keeps the sea in place. This friend is now 25 and still firmly believes this, and no matter how much we try and find holes in his theory, he manages to invent a way aorund it.
A childhood belief about places

others believed things like this
- I thought my imaginary friend was real and he imagined me
I hope he still believes I existAnon - My 5 year old daughter believes if she picks her nose her bum will fall off !!Anon
- I used to belief sloths lived in trees outside my childhood home. My older sister told me so.Anon
- My great-grandfather firmly believed, and had me convinced, that SPAM was mouse meat. — texasblue
- Apparently from seeing EKG's on TV, my daughter believes people die when their heart stops "beeping."— Jager
- my brother (10) still believes that if you stick your finger to far up your nose you can touch your brainAnon