"Tell me a little about yourself."
If you're the interviewer, there's a lot you should already know: The candidate's resume and cover letter should tell you plenty, and LinkedIn and Twitter and Facebook and Google can tell you more.
The goal of an interview is to determine whether the candidate will be outstanding in the job, and that means evaluating the skills and attitude required for that job. Does she need to be an empathetic leader? Ask about that. Does she need to take your company public? Ask about that.