There was a performance I caught where the audience energy was SO in tune with what was happening on stage. I couldn't believe it! It wasn't a special performance, no understudies, nothing different. Just a regular performance.
It was the same moment mentioned earlier, when Diana (Marin M.) entered with her suitcase at the end, the entire audience GASPED. Then she sang the first words "So anyway I'm leaving..." and then in unison, the audience began to audibly cry/sob. When the show was over, the audience instantaneously stood to its feet, except for one girl I saw in the box seats. She was sobbing so hard that she could not stand. Her friend was trying to comfort her and get her to breath. I stayed in my seat until the audience cleared out because I wanted to make sure she was OK. An usher had to help her out. As they walked past me, I heard the friend say to the usher that her mom was bi-polar, too.
I've seen the show a lot more than once, but that particular night, the audience's reaction is what I will always remember.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle