Using a Batman Reference
It’s possible that “The ends of the world” refers to the conclusion of The Dark Knight Rises, which is a Batman film (which we’re not sure about). We aren’t totally confident on that one.
It didn’t matter; the person on the other end recognized it immediately, and he or she was most certainly put off by it. We don’t know anything about that; we’re just guessing based on what we see here. It’s an intriguing way to conclude things, to say the least.