That's a literal interpretation, but it's an expression, not a scientific law. People often say something like "That never happens" about things that are simply very rare.

Seeing the rather literal tone of the conversation, I responded with an equally literal interpretation of the comic. Of course I know that the "local fertility goddess" is a figurative expression for the abundance of nature, but "no such thing as a free lunch" is also figurative, and "the pot calling the kettle black" isn't actually about a talking pot.