I have stopped the movies to show nature's great free light show when it was exceptional, as well as pointing out the wonders of the glaciers of Greenland. Very well appreciated, but one has to be careful, 400 people all straining to see causes a lot of disruption, and I'm afraid even very few cabin crew have witnessed the phenomenon. I wish we could show more, but one has to be careful about pointing out things outside- only the 3 seats by a window can see.