Kia's Wedding, Spontaneous Song

The singularly most amazing part of Kia and Daniel's wedding was when the whole room broke out into song, in perfect harmony, during dinner. Daniel's dad stood up, said "okay, now I think it's time for [song name here]" and then hummed 4 notes (the starting note for the various parts). Then everyone--in a room of about 100--started to sing.

And there was no rehearsal.