Answering interviewer questions is easy...what I think is impressive is if you ask lots of questions of them. It shows an interest that most prospects don't think about.
The most bizarre interview question I was ever asked was:
If you could be any kind of animal, what would you be and why?
When I was done...I told him since he would be my boss, I would like to know what kind of animal he would be and why? He laughed and so no one ever asked him that before.