Many people have shared this around the internet, but I had to, too. I was listening and remembering a time when various choirs I've belonged to have done the Hallelujah Chorus... but I started crying when I saw people who were obviously just onlookers occasionally getting caught up in it and singing along (about 90 seconds from the end, there's a mom sitting next to her little boy - who is standing on a chair to watch... she's taking his hand to make sure he doesn't fall and singing along!).
Great job! Amazing job! And mall acoustics... not too shabby!