I used to think that bodies were hollow, and that when you ate, the food would collect down at your toes, and just pile up until it reached your midsection - which is when you would then poo or pee (depending on how much you ate vs. drank, of course). Throwing up happened when you didn't go to the bathroom enough, and the food piled up so high that it reached your mouth.
A childhood belief about general

others believed things like this
- When I was young, I honestly believed that I would die before I reached high school. Anon
- I used to believe that once you reached a certain age you lost your imagination— Kiwi
- I use to believe that salt would cool food down while pepper would heat your foodAnon
- I used to believe when ordering Chinese food the food and delivery man came from China— Dave
- I thought when you got food poisoning it might someone had put poison in your food— Bootlebat
- I usd to believe that, all Americans were left handed and we all died when we reached our 100th birthday!— Greg Baron