No one has mentioned it but in the revival of Follies but when Rosalind Elias sang "One More Kiss" -- the audience may not have known who she was but at 82 she could hold the entire theater in your soaring operatic voice. You could literally hear a pin drop at the Kennedy Center when she hit the last note. There was literally a beat or two and then the place erupted in applause. I had tears streaming down my face.
The other was the end of Marry Poppins. (Spoiler): I was in he first row of the balcony/mezzanine and when she goes flies away up into the ceiling of the theater, She came right by me and was waving and was saying "Goodbye Everyone, Goodbye" and I found myself sobbing waving goodbye back at her saying "Good Marry Poppins, I love you" right back to her like a little kid.
"Whenever I get gloomy with the state of the world, I think about the arrivals gate at Heathrow Airport. General opinion's starting to make out that we live in a world of hatred and greed, but I don't see that. It seems to me that love is everywhere. Often it's not particularly dignified or newsworthy, but it's always there - fathers and sons, mothers and daughters, husbands and wives, boyfriends, girlfriends, old friends. When the planes hit the Twin Towers, as far as I know none of the phone calls from the people on board were messages of hate or revenge - they were all messages of love. If you look for it, I've got a sneaky feeling you'll find that love actually is all around."