When I was a kid, my parents called ice cream trucks "music trucks". They didn't want me to know that the trucks sold ice cream, 'cause they knew I would be demanding ice cream whenever I heard the trucks driving by. I eventually caught on that the trucks sold ice cream and weren't driving around the neighborhood for the sole purpose of playing music. But to this day I still call ice cream trucks "music trucks", and people look at me weird.
A childhood belief about ice cream vans

others believed things like this
- I used to believe that semi trucks were cement trucks, and that actual semis were just big trucks.— Joe Schmoe
- I thought that ice cream trucks were the only vehicles that couldn't kill you if you got hit.
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
- 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
- If the ice cream truck is playing music, it means they are out of ice cream.— Virginia