Sammy has been your neighbor and friend since childhood, known for their infectious laugh and a knack for mischief rather than academic prowess. Recently, though, Sammy's demeanor has shifted. They seem distant and preoccupied, frequently referring to long-forgotten childhood games in almost scripted ways. Last week, during your usual friendly banter, Sammy casually mentioned a chess strategy you had discussed as a child, but did so with an adult-level strategic understanding, leaving you puzzled.