I have been posting a business/productivity/mastermindish type article every Sunday on LinkedIn for a few weeks now.
Usually, I take a post or part of a post I've published here first, revise it, clean it up, and post it.
The "Columbo" post is from an idea I read somewhere on Mark Forster's site, though I cannot now find the reference. I put a structure around it, added the Columbo references, a dash of 3 Principles, and there it was.
I had wanted to present this video compilation of Columbo's "just one more thing" tactic, but the studios restricted the video's playback to YouTube only. Shame.
So the only video I could really link to that worked with my article was the following short (under 10 seconds) video illustrating what you need to do when you hear that "just one more thing" gremlin in your ear.