The AI does not hate you, nor does it love you, but you are made out of atoms which it can use for something else. — Eliezer Yudkowsky, Artificial Intelligence as a Positive and Negative Factor in Global Risk
This includes everything in my opinion. Goals, utility and value, economics, perspective...or was I supposed to come up with my own version? :-)
I've been using something like "A self-optimizing AI would be so powerful that it will just roll over the human race unless it's programmed to not do that."
Any others?