When I was about 5 we moved to a new house, which scared the willies out of our (already timid) cat, Roger. Every time he heard a noise he'd run to hide, and his favourite hiding place was inside our electronic organ (there was an opening above the volume-pedal...) Well, for a while there, I was pretty convinced that inside our organ was this giant cat-city where Roger was royalty, and the reason he went there so often was because his feline subjects needed him.
Actually, despite the fact that I grew out of that belief, I still felt a twinge of surprise when I actually looked inside the organ, and instead of the vast, softly lit city I'd always imagined, there was...the back of the pedals and keys, and a whole lot of dust. Bit of a disappointment, actually,.
A childhood belief about cats and dogs

others believed things like this
- I used to believe that a 'soul' was an organ of the human body, such as a kidney or lung. — Grace
- When I was little I use to belief that if we swallowed the pit of a fruit, a tree would grow inside us.— Maya
- I used to believe that electricity was manufactured in a factory in a place called 'Electriz City'.— Sally
- I used to believe that the inside of my body looked like bologna.— Stephenie
- when I was little i was scared of vacuum cleaners. I thought they would suck me inside of them.— Julie
- When I was little, I was convinced that musicians lived inside the radio...little versions of them, that is!— pcmkrfn