I used to believe that all ice cream vans played the same music - some sort of universal siren for ice cream vans.
(it was the London Bells nursery rhyme... you know the one...Oranges and lemons, Ring the Bells at St. Clemens.....)
A childhood belief about ice cream vans

others believed things like this
- My dad told me that ice cream vans only play music when they have run out of ice cream. Anon
- My mother told me that ice cream vans were ambulances for little children.— Buzz
- My parents told me that when the ice cream van was playing music, it means he's run out of ice cream :(Anon
- My mum told us that when the ice cream van played music, it was to tell you that he had run out of ice-creams.— J
- 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 believe that if the ice cream truck was playing music, it had sold out of ice cream.— Deprived of ice cream