Mirror Their Movements
Want the job? Then you've got to be likeable and one way you could possibly do that is by mirroring your interviewer. But remember, while mirroring is often subconscious, you can certainly control it by paying attention to how your interviewer's nonverbals, especially his/her body language and tone of voice. But keep it very subtle, otherwise it might backfire.
Take Your Time
You might feel compelled to answer each question right away, but don't be afraid to take a few seconds to collect your thoughts because that is what will keep your hunt for the job alive.  By taking time to answer, it not only will let your answers sound more articulate, but you'll sound more confident to your interviewer. In addition it also makes the interviewer think that you might be the right prospect.
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