Having fun, I think once machines get to the point they do things just for leisure, well that might actually be interesting.

Any action that requires the experience of humanity, I’d guess. I’ll leave it up as an exercise to the reader what sorts of activities that entails.

Getting creative inspiration when abusing substances and becoming wealthy from it.

Justifying anything by bending logic and doing mental gynmastics.

Looking after children. If that is ever solved then it'll be time for the Matrix.

Building algorithmic trading models. Because the reflexivity of the markets.

Converting pizzas into energy.

Destroying themselves. (irrational behavior) /s