Her mischief isn't malice. It's an experiment. "If I act out," she seems to ask the void, "will anyone actually see me? Or am I just the shadow of my brother's spotlight?"

The episode's true horror lies in the kitchen. Pastor Rob and Mary share a prayer that lasts a second too long. George watches from the living room, a can of beer in his hand, realizing he is no longer the protagonist of his own marriage. He has become the —expanding away from Mary's warmth, unable to pull back.

His famous line in the episode isn't a joke about eccentricity; it's a confession of metaphysical terror: "If I am not a physicist, then I am merely a collection of carbon atoms that learned to speak."