What is the scariest AI theory?

I'm curious, what is the scariest AI theory that's been floating around in the tech world lately? Is it the idea of AI becoming so advanced that it surpasses human intelligence, potentially leading to a scenario where it's no longer controllable? Or is it something else entirely, like the possibility of AI-driven economic disruptions or even ethical dilemmas related to the use of AI in warfare? I'd love to hear your thoughts on the most frightening theories surrounding artificial intelligence.