donkey boiler (noun)

1. In the mystical world of dragons and wizards, the donkey boiler powered the enchanted airship when it landed in the floating city.

2. During the golden age of sail, the donkey boiler provided steam for a ship's services while docked at a busy port.

3. In the superhero comic, the donkey boiler on the hero's spacecraft malfunctioned, jeopardizing their secret base on Earth.

4. Why did the sailor bring a donkey to the dock? To keep the donkey boiler running while the ship was in port!