What do you do once in a blue moon?
Once in a blue moon, I buy myself a pair of shoes.
The moon rotates around the earth. A moon rotates around a planet. There could be a blue moon in outer space. Once upon a time, there was one. On that moon, there was a hairy, hidious but kind, open-minded and smart alian that admired Arlyn for her beauty, so he learned English very hard in the hope that he could come to the earth to talk with her -- just like the story of mermaid and the prince.
From a blue moon.
I know, from what planet?
Alien=A being living in another planet.