Have you ever been trapped in an unwelcome, one-sided conversation? Ever needed to be rescued? Then you need Lunarbaboon's Son Signal.
This happened a lot at one library that I worked at. We worked out a system for freeing librarians from endless conversations like these.
But the anecdote was meant to accentuate the comic. Maybe it veered off-topic. I don't think I've ever been in the precisely same parenting situation that the comic describes. Let me see if I can reword the post.