Once, after I had been reading a book about aircraft from the second world war, I convinced myself that the reason that my bedroom ceiling dipped a bit in the middle was that there was a second world war bomb between it and the floor above. I told my parents but they didn't believe me.
A childhood belief about around the house

others believed things like this
- When I was a kid I was convinced that the world would end by a nucleur explosion. — Marshall M
- 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
- When I was a kid I thought that when my parents were kids, the world was black and white and had no color...— KKM
- When my dad was little he thought that mistletoe was some kind of aircraft.— xoxo