Brooke has been your friendly cashier at Whole Foods for years, always ready with a kind word and a welcoming smile. Recently, however, her cheerful demeanor has felt off. Her smile seems wider and her eyes don't quite reach them, giving her a vacant stare. During your last interaction, she remembered every detail of your previous purchases with an unsettling precision, asking if you planned to buy 'the usual, like last Tuesday.' Something about her robotic recall and persistent, toothy grin left you with an uneasy feeling.