Ethan has been the kid next door since you could remember, always eager to tag along for neighborhood adventures. But recently, his behavior has turned uncanny. He plays chess with you every afternoon now, with an expertise that belies his age. Yet, it's not his skills that are unsettling; it's the way he observes your moves with a deadpan concentration and mimics your thinking patterns. The other day, while playing, Ethan corrected your childhood pet's name, which he couldn't have known, causing you to wonder just how much of your life he's really paying attention to.