I have interviewed dozens of people in the last seven years. Two questions I always ask are...
Can you tell me about yourself?
This open question allows the person enough rope to hang themselves. I have had people tell me they want to go back to school in six months, they are trying to get pregnant, just got out of rehab and are getting straight. I love that question!
Second I like to use is...
Where do you see yourself in five years?
I get to look at how long they plan to work for me, without asking directly.