Don't even get me started on interviews.
Some interviewers, particularly recruiting agencies, wouldn't recognize the right guy if Jesus came down an pointed at him, especially because they sometimes know absolutely nothing about the job.
It can be extrrrrrrrrrrremely frustrating.
I myself happen to like the good ol' "good morning, Sir, see, I really want the job, I work hard, am experienced and knowledgeable and won't give you any problems", but interviewers do not always like it.
My advice would be: play by their rules.
If the interviewer seems to like brilliant, dynamic, creative young people blablabalh (and if the interviewer works for some big, fashionable company that is always the case) then pretend to be one.
If the interviewer is an old fashioned, working class uncle Joe, he may like better the humble "I work hard, Sir".