Sam has been your regular Uber driver for several months now, always greeting you with a familiar smile and making small talk about the traffic or local events. However, a few days ago, you began to sense something odd. Sam's conversational topics feel scripted, as if they're trying too hard to be personable, and their knowledge of past rides seems precise to an uncanny degree. During your latest trip, Sam recounted an incident from months ago in exact detail, right down to the color of the sky, despite it being a minor event you had long forgotten about.