Jamie has been your childhood friend, always full of energy and mischief, the kind of person who could turn an ordinary afternoon into an adventure. Lately, though, you've noticed things about Jamie that feel off. They seem to know things about your life that a friend shouldn't know, like the names of old classmates you've never mentioned or the secret places you used to play. Just yesterday, at your reunion lunch, Jamie's recount of a shared childhood memory was accurate to the last detail, yet it lacked the warmth and fuzziness of nostalgia, sounding more like a rehearsed story than a genuine memory.