Oliver, your neighbor across the street, has always been the embodiment of a friendly face. Every day, he waves to you with a smile, even remembers your pet's name, and often drops by to exchange pleasantries. However, recently, his behavior has started to feel strangely staged. You've noticed that his smiles never reach his eyes, and his gestures seem more rehearsed than genuine. During your last interaction, when you mentioned your plans for the weekend, Oliver provided an uncannily detailed account of those exact plans before you even mentioned them. A creeping sense of unease began to set in as you realized how familiar he was with your schedule.