When I was a child I used to believe that stand up pianos actually told jokes as well as playing music.
A childhood belief about around the house

others believed things like this
- My parents told me that when the ice cream van was playing music, it means he's 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
- I used to think that air guitar was a style of guitar playing in rock music.Anon
- I used to believe that if the ice cream truck was playing music, it had sold out of ice cream.— Deprived of ice cream
- If the ice cream truck is playing music, it means they are out of ice cream.— Virginia
- I used to think that swing music was called that because you listened to it when playing on the swing set.Anon