I think that this thread needs some kind of feedback to see if the explanations worsk well with the layman due to the particuliar nature of this thread. I don't have an explanation in layman's term but I can provide some feedback.
I think that Rrhain's explanation works well to explain how entropy works and is easily understandable for most people. The water analogy explains well why entropy says perpetual motion machine can't exist. I also liked how he explained the difference between energy and usable energy.
I thought that Son Goku explained well why entropy worked the way it does but I'm less sure that it could reach the masses because lots of people seem to dislike maths (but I may be mistaken).
Overall, those were my 2 favorites explanation, Rrhain explaining how entropy works whereas Son Goku explaining why it works this way.
(If this post has no place in this thread, tell me, I will delete the content)