A relative told me when I was very young that the oreo crumbs in the middle of an ice cream cake were coffee grounds. I didn't learn otherwise until I was at least 8 years old!
A childhood belief about sweeties

others believed things like this
- I always refused to eat coffeecake because I thought it was made with coffee grounds. Anon
- I used to believe making a cake from scratch meant using a box mix rather than buying a cake from the store.— EZ
- My parents told me that when the ice cream van was playing music, it means he's run out of ice cream :(Anon
- My dad told me that ice cream vans only play music when they have run out of ice cream. Anon
- when i was a kid my mother told me that when the ice cream man was playing his music he was out of ice cream— Lynnzea
- When I was a kid, I used to believe that cadbury cream eggs real uncooked eggs in the middle Anon