[brnstz]

Ask a question that has more than 1 right answer (and also more than 3 right answers). To be honest, I do the "cultural" fit while I do the "technical" interview.

How would you approach solving <insert some problem>? Dig into their solution for its technical merits, downsides, pitfalls, etc. But, more importantly, pay attention to how they react when they are challenged, whether they overcomplicate things or whether they hand-wave around real problems. Do they know when to say "it depends" or "I don't know"?

You can get a "right" answer and still "fail" the test. My feedback will basically be, "This person is smart and I can't justify saying 'no' but..."

The "cultural" question is "Do you want to work with this person?" So try working with them not at them.