My father told me when I was quite young (2-3) that the bellybutton was connected to the tongue. I used to stick my finger in his bellybutton and his tongue would come out. When it didn't work on me, he said that it was a thing you grew into.
A childhood belief about belly buttons

others believed things like this
- I was told when young that if i kept poking my bellybutton my bum would drop off.— vicky
- that if you stuck out your tongue at your mother, your hand would stick up out of the grave when you died.— Elaine. London
- My uncle told me if you twist your bellybutton, your bum will fall off, I was terrified!— little2ft
- I use to believe that if you told a story/lie you would get a bump on your tongue.Anon
- i was told that if i kept biting my nails i would grow hairs on my tongue i was 10 yrs old by the way— charlotte anderson
- I was told that if you sleep on your back you swallow your tongue...I have been sleeping on my side ever since— scotty la