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It really depends on the type of job, some jobs you need to be professional, some you need to show you would suit the job. Be yourself, sell youself, try to read the person conducting the interview and adapt your behavious to suit, convince them you are the best person for the job. I'd recommend looking at this and downloading the interviews pdf on interview skills and preparation:
I also got an interview on the spot. But this asian bastard and a bunch of other people got a job over me just because i had semi long hair :(
Breath mints....... Trust me.