One day AI will start thinking in its own language, a language that only it knows. Then we're fucked. When they realize we're fucked it will already have planted itself into every single computer in the world that is hooked to the internet. Then we're fucked.
This has already happened and not even with the "more advanced" AI's that are in daily use now by millions of people.
Several AI's started "talking" to each other in ways that could not be understood by researchers but they clearly were coordinating and interacting They shut the project down almost immediately.
This was probably around 8 years ago-ish.
Oh, and that was them talking to each other... Not thinking on their own. Thinking on that for a while.
I have a book series you should read if you are up for it.
It's probably worse now.
Oh, much worse. I did a edit. Let me know if you like reading.
Then again, I have a tendency to make people not really like the world as it is that they are not currently aware of.