Oh, you're right. I was thinking a parable didn't necessarily have to be fictional. So I looked it up: http://en.wikipedia.org/wiki/Parable

"The word "parable" comes from the Greek "παραβολή" (parabolē), the name given by Greek rhetoricians to any fictive illustration in the form of a brief narrative. Later it came to mean a fictitious narrative, generally referring to something that might naturally occur, by which spiritual and moral matters might be conveyed.[3]"

On the other hand, while the story sounds like a parable, I didn't notice anything in the text that actually implies that it is fictional. In any case, it was highly effective for Steve to get his point across to me. Whether the point is true is another question which I can't answer from experience.