Taxiing up to the gate last night in HNL inbound from KON on HA 287, the click of the cabin PA, then, totally unexpectedly, an a cappella christmas carol, "the chestnuts roasting on an open fire" one, the most beautiful use of a cabin PA system I have ever heard. The FA who sang it ended it with, "only on Hawaiian". The cabin erupted in applause, and shouts of "hana hou". I would add, "only in Hawaii".