Lust: Always be Professional -- Even if Your Interview isn't
Maintaining professionalism is paramount to a successful job search. If an interview is going well, or you have an inside reference at the company, it may seem appropriate to let your guard down a bit. However, always err on the side of caution; your professional discretion may determine whether or not you get the job. No matter how well the interview is going, or how comfortable you feel, bringing up personal issues, disparaging past employers, or acting unprofessionally are always unacceptable. This also includes what you wear to an interview and body language. Dress conservatively, even if the office is more casual, and be aware of your body language at all times so you don't inadvertently give off the wrong impression.