I the only one who doesn’t want it to be some random curse that makes them all start singing
I dont think is a case of what fans want, is more a case of what fans expect the writers to do, because fans no longer trust them to have great ideas to come out with a great plot to the episode that doesnt involve a curse to make them sing, or someone dreaming or even Henry writing them singing, all these options are easy, so they won`t surprise the fans much.
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"I offended you with my opinion? Ha, you should hear the ones I keep to myself".