Jamie has been your childhood friend who recently moved back to town, bringing with them a treasure trove of shared memories and experiences. You remember Jamie as the one who always had your back, someone you could tell anything to. But lately, their behavior has felt subtly off. It started with Jamie calling you by a childhood nickname you haven't used in years, and has escalated to them finishing your sentences and knowing details about your life that they couldn't possibly remember. Last night, at your favorite diner, Jamie's attempts to reminisce about old times were tainted by their precise recall of events and people you were sure they had never met. You're beginning to feel that something is deeply amiss with your old friend.