Different Ways (Interview Skills) to deal with different situations

Difficult or Challenging Interviewee 
If you have a interviewee that is being either difficult or challenging about the interview/questions asked/topic in general there are a number of ways to deal with it;

Firstly don't let them take control of the interview at all time you must be in control of your interview if the interviewee starts to try take control by asking you question answer them but then remind them of the interview at hand and start to ask them double of amount of questions back to let them know whose interview it is. Then if they start to be difficult with the question your asking and either trying to change the subject or refuses to answer do either one of two things ask them why they don't want to answer or restructure the question and ask it again so you are able to overall gain the answer you have set out to get.

Secondly and lastly if they are being difficult or challenging to the point the interview looks like its beginning to get heated keep calm and explore why things are getting heated by finding out why they don't want to talk about that subject, if it starts to continue getting heated move on but always come back with a smiler question to fit too the subject matter.

Emotional Interviewee 
If your interviewee begins to get emotional from the interview/subject matter/questions asked then while refraysing your question start to comfort them by offering a tissue use less body language and start to talk in a different tone of voice to start to show your not here to upset (changing the tone in your voice can show you care and your not in a big rush to get the answers) while doing this asking a question in a more gently way to make them feel comfortable, also saying things like "In your own time....no rush" while make them feel more comfortable and more willing to answer the questions.  

Interviewee Reluctant to Talk 
Finally if your interviewee is reluctant to talk depending on the subject matter you either ask them why they are reluctant to talk about the subject that you have put forward or if they are too upset and are reluctant because of that you start to try relate to them, make them feel comfortable in the interview by letting them feel they don't have to answer the question if they don't want too while restructing the question and trying to get the answer out of them while making them feel comfortable at the same time by using suggestive questions like "Well if you don't feel like answering that question how do you feel about this one?" and explaining yourself why your asking the questions at hand and use a lot of evidence to back up points and questions.