When I was little I saw a documentary about fungi and how they reproduce releasing spores, and how they decompose organic matter to get their nutrition.
I spent my whole childhood afraid of accidentaly breathing spores in and having a whole forest of mushrooms and other fungi growing inside my body, consuming it slowly from the inside out until I died.
A childhood belief about people

others believed things like this
- I used to believe people grew from spores and when we got old, we'd grow leaves and flowers etc— Calvin (from my pet tiger Hobbes)
- I used to believe in the 'little men' that worked inside your body.Anon
- I used to believe that when there was static on the tv, it would be showing the inside of your body.— Dr.Starr2.0
- I used to believe that the inside of my body looked like bologna.— Stephenie
- I used to believe that ants walked inside your body and that's what caused an itch.Anon
- When I was little I believed little men and little women worked inside my body to make everything work.— Ashley