Some definite no-no's: showing up in bright orange sweats with greasy hair to fill out an app, arguing with our receptionist, not filling in the app and writing "see resume" instead, and calling me every morning to see if I read his app yet when I specifically said I didn't have time and would call him if I was interested. More subtle red flags: not having an idea where they want to be in 5 years, having issues with all of their past employers, using the response "I don't know" without giving it much thought. I send away all my candidates with the same response: "we'll get back with those candidates we're interested in interviewing with management." If you don't hear from me in a week, call one time. If I'm truly interested I'll give you a specific schedule of when we'll make a decision. If I'm vague, I'm not interested. TJNTIY.