an unexpected analogy

This phone conversation with a customer (who I've met once) today made perfect sense at the time and only prompted the "wait, what?" reaction later:

Me: In your application, what's the difference between a Thingie and a Whatsis? [Names have been changed to protect the... oh, never mind.]

Him: Do you remember "I'm Just a Bill" from Schoolhouse Rock?

Me: Certainly.

Him: A Thingie is like the bill; when it's signed into law it becomes a Whatsis.

Me: But it looks like it can still change... you have executive orders?

Only later did it occur to me to wonder why he didn't just say a Thingie was a draft or a proposal and a Whatsis was the approved form... but it was more fun this way, even if it took me a while to then get that song out of my head. So now I share that earworm with some of you. :-)