Chances are, if you've ever been in a job interview, you've been asked a question that's funny, inappropriate, or just plain bizarre. Technology professionals are no exception to this experience. You code and manage. You've answered every answer correctly.
Single people work more.
That's a lot of job interviews. Add that to the fact that quite often the interviewee knows more about the skills and the job than the interviewer, you have lots of fodder for some really weird questions. I'm dead serious.