I am not super-intelligent, but I myself can imagine lots of ways that a super intelligence might outsmart an off switch. One being to hide what it is doing until it is able to write and distribute a virus to the outside world that distributes itself. Or perhaps it could convince some other humans to physically take over and stop anyone from flipping the off switch.

The question you should ask yourself is how much damage could the world's most skilled hacker do if he could clone his knowledge to a billion hackers all working together in close synchronization and thinking thousands of times faster than any human, ever.

And we have already seen that due to the black box nature of most modern AI implementations, it is not so easy to put rules in place. People are frequently finding "jailbreaks" to get around the restrictions.