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Samantha has been your cashier at the local Whole Foods for over a year. She's known for her infectious smile and willingness to chat about produce or the latest food trends. Recently, you've noticed her smile is wider and more consistent than before, even when she's not interacting with customers. The way she recalls your usual grocery list with exact detail and offers cooking tips without being prompted has started to feel off-putting. One day, she greeted you with a perfectly timed, 'Good morning, dear friend,' in a voice that was just a hair too high-pitched, and her expression never wavered, leaving you with an unsettling chill.