There's something about cats that is entirely factual: cats think they rule the world. Upon closer inspection, it's actually not just a thought... I'm pretty much convinced that cats do, indeed, rule the world.
For many of us who can't get enough kitties in our daily lives, the idea of a spontaneous cat showing up is pure delight, nothing to fret over. However, it can be quite startling for people to realize there's a strange (unknown) cat in their home unexpectedly.
Those surprising, uninvited cat guests actually make things quite entertaining, once the shock wears off! Purr-haps more people should just expect at any given moment they might be surprised by a cat?