Too Late

With unemployment being at an all time high, I do not understand applicant etiquette. For the past few years, when I schedule interviews I always agree upon a time that is good for the person applying for the job. I confirm the time as I hang up the phone. I go over directions to my office. They are clear cut and not hard to understand. That being said, I do not understand how someone can walk in late to an interview. I give a five minute "things can happen" excuse time, but that is it. If you arrive more than five minutes late, I will not interview you. If you are late to the interview, when you want the job, you will be late for the job when you have it.