Ask him/her these:

1.Spend two minutes to introduce himself/herself.
2. Three top strengths.
3. Three top weakness.
4. Hobbies.
5. Short term plan.
6. Long term plan.
7. What can he bring to the company.
8. Which kind of working environment does he like?
9. Expectation about this job.
10. Marriage, age, gay/le*****ian if you dare.