They're not just interviewing you, you're also interviewing them. One of my writing groups had us do reverse interview questions for prospective managers. Here are the ones I came up with. (I will not actually be asking these, but they are the things I would want to know.)
1. Describe a situation in which you had to take a stand on a value or principle which was unpopular.
2. Give an example of a time you went out of your way to help someone who couldn’t benefit you professionally.