That sounds like a wonderful moment. Thanks for sharing. I only wish a great setup and great music (and maybe a great deal) were all it took to make me--and apparently your guest--feel as strongly. There are, for better or worse, other factors involved, as Ghosthouse says.
It has happened to me once or twice. The most embarrassing time was when I installed a budget system I had purchased for a friend and played it for the first time. She wanted to hear Joni Mitchell singing "Both Sides Now". (Gee, with that song, maybe I should have seen it coming.)
We didn't know each other as well as all that so when the tears started to flow I felt pretty awkward. The system was a Rotel RCD-855, a Harman-Kardon HK630 from the 70s, and a pair of Energy 2.1s mounted on the wall.