Interesting idea for a thread, Arnold.
For me (and my wife, who enjoys our layout very much,) an especially and unexpectedly (because it wasn't planned to be as it developed) enjoyable sharing of the layout occurred when we had invited this group of seminarians, along with our Pastor, to our home for a Christmas luncheon.
The trains were ready to run, of course, especial since it was Holiday time, but I had not mentioned the layout to them; rather, during champagne in the living room when they first came into our home, it was Father who asked if they could see the trains. I was surprised because our Pastor had not shown any particular interest in the trains, previously, beyond his natural courtesy.
I preceded their going down to the basement, to get the whole shebang cranked-up and sounding its special cacophony, by the time they began their decent, escorted by my wife down the stairs. From my position at the bank of ZWs, I was able to observe them descending the stairs in their cassocks, and heard and watched their unbridled joy in discovering the trains and miniature community unfolding in front of them, and I was thrilled, frankly, as was my wife. The seminarians began scurrying throughout the trainroom, moving carefully, but voicing exclamations about every detail they saw, as they noticed them and shared independent discoveries with one another and us. They were very, very happy. I can still hear them and feel their presence that day in my mind.
The whole experience felt like a Corporal Work of Mercy, knowing that when these seminarians returned to their studies at the seminary, they would, likely, never see a train layout again. Some of them were about to leave for Rome, and I was absolutely positive they would not be seeing model trains there (!) A serendipitous moment had turned out to be 1 1/2 hrs. of adult playtime, of a sort, not counting the luncheon afterwards !
Seeing their happiness was a tremendous Christmas gift, to me. I was grateful for their joy and remember thinking to myself that the best things and times are those that are shared with others. Unfortunately, we did not have cell phones possessed of cameras, at that time, so we had no way of preserving the event, beyond the joy in everybody's hearts. The layout had made somebody happy. That was the greatest , for me, and for my wife.