Yes, I was under the impression that it would be possible to undo your belly button and see your insides. After much experimentation with trying to look inside my own belly button, I gave up.
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 believe that If I stuck my finger really far inside of my belly button I could touch my insides.Anon
- i used to believe that playing with your belly button would lead to your insides pouring outAnon
- I used to think that if i touched my belly button it would unfold and my belly would be inside out forever. Anon
- I used to believe that belly button lint came from the *inside*. Why else would it always be the same color?Anon
- babies come out of your belly button— Kit