Here I am laughing at what kids think. As a kid I've believed a couple of the things as well.
Until I get the to gum section. Imagine my shock to learn that gum does NOT stay in the stomach for several years like I've always believed. I had to Google it to prove myself wrong just now. I'm 34.
A childhood belief about chewing gum

others believed things like this
- I believed the urban legend that gum stayed in your stomach for 7 years if you swallowed it.— Lindsay
- I always believed as a child your stomach was a big hand which squeezed your food out through your bum....— amc
- We put food in our mouths, so naturally I believed my stomach was in my head.— Timb
- I thought google was a place where they sold goggles online— google
- i used to believe that parents do things to make there children happier. well i was wrong. — Emma C.
- when i was a kid i believed i could make things happen just by snapping my fingers like in mary poppins!!Anon