This question, and various similar provocative questions like it, is often asked to see how you will react to pressure. Many people asked this type of question fall into immediate defense of their skills, and try to speak without taking time to respond appropriately. A good approach is to answer with something positive like:

"That is what we are here to explore. So far, I see no reason to believe I do not have the qualifications you are looking for. Do you have some specific concerns we can discuss?"

If an interviewer is stupid enough to bring in unqualified candidates for an interview, they should be the one to explain why they are wasting your time as a potential employee. The fact that you were scheduled for an interview shows there was something about your background of interest to the company. When you find out what these interests are you can exploit them to your advantage.

At the end of an interview, you will often be invited to ask any questions you may have about the company or the interview process. This segment may be crucial to your success, no matter how grueling the time may have appeared to be. There are a number of things you should always ask before leaving an interview. Write these questions down and take them with you. Ask when the company expects to make a decision on hiring for the position. This will give you an idea for how long to wait for a result. Ask if there are any issues or concerns they may still have about your skills and qualifications for the job.

Using this method, I once learned that I was about to be eliminated because the interviewer felt there were some weaknesses in my skill sets. When I filled in more information regarding those concerns, the interviewer was visibly moved to change their opinion. I had to nudge them into writing down this new information, because in their mind, the interview was over before we had this conversation. Always remember that an interview is not over until you leave the room. Apply any insights you receive as they occur. On this occasion, I turned a failed interview into a job offer.

In some professional instances, part of the interview process requires a candidate to "prove" themselves by addressing a very detailed scenario or issue. When a company makes you feel like they are asking you a question related to a problem they are currently struggling with, be cautious about the level of detail you are willing to provide. When an interview moves to the level of asking you to give them some free consulting advice, you can decide if you want to do the work for nothing, or insist on being paid to resolve an issue of that magnitude.

From my own background, I have had people tell me they were asked by a company to offer some solutions that were implemented by the company, but the firm refused to hire the candidate. Business is not immune to engaging in unethical practices, so be aware when you are being asked for too much free information.

There are other "tests" of your skills that often come in the form of a series of skill related trivia questions that have been prepared by employees prior to an interview. If these lists become too detailed or extensive for you to answer, and you want to be considered for the position, challenge the interviewer to recognize that your inability to answer these types of questions is not lacking skill, but would require reference you do not have available in the interview setting. Counter their trivia with information of your own that they may not be carrying around in their head. This is particularly true of technical interviews where there are lots of detailed questions about particular systems or software. Let the interviewer know that you might need a day or two to get settled in on the issues they deal with on a regular basis.

Have you gone part way through an interview, and found yourself wondering, "What the heck am I doing here?" When this type of impulse strikes you, there is no need for you to cruise through the rest of the formalities. If you landed an interview that you are absolutely not interested in finishing, do not be shy about politely bringing it to a close. You might consider saying something like, "Excuse me, I don't think I need to waste your time with this. It does not look like the organization is going to be a fit for me. Thank you for inviting me, but I think I will be leaving now."

This kind of exit can boost your self confidence and make you feel more in control of your own destiny. If you experience problems with answering particular types of interview questions, try checking with others for insights on how to respond professionally.