As a coach, there are a number of stories that I usually talk about to my new teams to help them understand what my job is all about.
One I like to use with teams that think they already know agile is one I call “the night sky” which I based on my own personal experience. It goes something like this; when I was a kid growing up in the suburbs, I frequently played games outside with my friends at night. Sometimes we would look up at the sky and try to identify those constellations we knew. Most often we found the big and little dipper, but our limited knowledge (and limited view) allowed for little else. Nevertheless, to me this was the night sky.