Smokey's Getting Angry

This cat isn't Smokey; I'll get to that in a moment. I have no idea what this cat's name is, but it wanders through on a regular basis, and feels quite at home. Here it's napping out by the far property line. Meanwhile, our cat (Smokey), who is an indoor-only cat, gets very annoyed that his territory -- defined by him as everything he can see -- is being encroached upon.