Well as we all know, people in stores (i.e. Tom Nook) tend to follow you. Maybe a bit closer than you'd like. Do you ever take your time and just run from them and see how long it takes them to reach you? I do that a lot, specially when I'm bored.
I used to do that in the original AC. They would follow you around in circles and it really bothered me. I guess i still bear a grudge with booker, that's why i picked the modern police station with copper in it.