what #1. interviews.

What to do for an interview.

FOR THE HANDSHAKE
1.  Make sure your hands are as warm and non-sweaty as you can possibly make them.  As a friend of mine used to say, just use talc.  Talc keeps your hands dry, rough, and manly.  The handshake is much like the Harlem Shake - either you win, or you don't.  Either you do the Harlem Shake, or you don't.  No?  No connection?  Moving on.
2.  Firmidity.  Make sure your interviewer is pleasantly surprised by the energy imbued within your hands; try to outdo him, but only by a little.  It shows your competitivity, but only by a little.  Like you won't take his job in five years, you'll do it in ten.  For her... (meaning female interviewers) just off a bit.  Let her win.  Females like it when they win.

FOR THE EYES
1.  Ah.  You must show intensity within those deep pools.  Intensity enough to show that you will take his job, but in ten years, not in five.  Intensity enough to show that customers will not sass you, but will still be able to complain [quietly and respectfully, lest they be beat to pulp].  Intensity enough to show that you mean lots of good, good things.  You, the person.  As an employee.
2.  It also helps to have eyes that change colour often.  I mean, if you're looking intensely at your interviewer and your eyes change colour, you WILL get the job.  No bout.  *Doubt.  Being someone whose eyes fundamentally cannot change colour, I wouldn't know if they do that in daytime during interviews.  But... if you're lucky.

FOR THE RESUME
1.  ...lolwut?  << None of that.

Otherwise, just smile, speak like a boss (but still subserviently, but with authority, so he knows you mean business, but not that much business, like you won't take his job in five years, you'll do it in ten).  
DON'T: 
a) wear earrings or glasses [for men] || 
b) drink, smoke, or snort || 
c) flirt || 
d) make bodily... noises you will regret making in public, because your interviewer IS the public. 

And you know... if you work with customers:
The customers are angels.