Me, I'd get them to watch Toy Story 3. If they didn't cry or be at all moved by that film (yeah, I just saw it. How did you guess?) then they have no soul and are either undead, a robot, or both.
So, suppose you suspect your neighbour of being something of that kind? How would you check?
So, suppose you suspect your neighbour of being something of that kind? How would you check?