I've had some luck using it to judge the effectiveness of executives too. Like, just ask GPT what the company should do in a 5 point plan, and then review whether it's better or worse than the current leadership. Or make it write a pitch to a client and compare its word salad to our word salad. Or ask it to resolve an interpersonal conflict and see if it botches it worse than the current manager.

Our programmers and marketing staff are allowed to use GPT (although they have to use their judgement on whether the results are good enough), but personally I find the above use cases far more amusing!