in star trek IV, the voyage home, captain kirk and crew travel through time to san francisco (yippee!) where, after run-ins with the law and a screetchy blonde biologist chick, they return to the future with two humpback whales named george and gracie. the whales' song helps save earth from destruction, and all is well in the world post-ocean crash landing. so is it a coincidence that bart's synthesized voices, those which tell us about arrival announcements, train delays, and probably survival strategies should a major earthquake hit, are also named george and gracie? i think not.