While the "what did you have for lunch" question may do a bit to surprise the interviewer, there is probably a more valuable go-to question that can be fairly generic in any sort of interview type experience.
"If you were me, what would you improve on (work on, learn next, etc etc)?"
This is beneficial both for the interviewer and you as an interviewee. It lets the interviewer consider you specifically in the context of "are you missing something", and gives them a good opportunity of letting you know where they see your holes/flaws. It also let's them know that you are willing to learn, and trying to understand how to grow and change.
The interviewer will be asking themselves these sorts of questions after the interview anyway, so why not try to get their feedback right then and there, with a potential opportunity for you to correct them, if they think you are missing something that you actually have.
"If you were me, what would you improve on (work on, learn next, etc etc)?"
This is beneficial both for the interviewer and you as an interviewee. It lets the interviewer consider you specifically in the context of "are you missing something", and gives them a good opportunity of letting you know where they see your holes/flaws. It also let's them know that you are willing to learn, and trying to understand how to grow and change.
The interviewer will be asking themselves these sorts of questions after the interview anyway, so why not try to get their feedback right then and there, with a potential opportunity for you to correct them, if they think you are missing something that you actually have.