There was this cartoon I saw many years ago, I never got the name.
It had a kingdom where people thought that dragons were pests, one day a dragon crept into the castle and at this time the kingdom was freezing cold because the boiler wouldn't work.
The dragon crept down into the cellar where the boiler was because it liked it there being damp and the dragon breathed fire into the boiler and lit it, after this the people thought that
Dragons were useful and started to use them for everything. Then one day the dragons thought they were being abused and neglected and started to disappear because the people stopped
Believing in dragons as they were just something they used.
An so it ended there?