I used to believe, because my dad said so, that my arms, legs and head were all held on by cords attached to my belly button. If my belly button were to fall off, I would fall apart. It made sense to me because that's how G.I. Joe dolls were made.
A childhood belief about belly buttons

others believed things like this
- If you undo your belly-button with a screwdriver, your legs will fall off.— Toby
- I used to think that babies were made when you press your mums belly button.
Then a baby would fall out— Chris Hyndman - someone could unscrew my belly button, and if they did, my head would fall offAnon
- When I was a kid my dad told me that if you unscrewed your belly button your bum would fall off.— Ann
- i was told that if you fiddled with your belly-button too much, my bum would fall off.Anon
- I believed that if you pushed your belly button, your bum would fall off.— Wendy