Don't show up with coffee . For some reason' lots of people think bringing a to - go cup of coffee to a job interview is a great idea. To an interviewer; this looks informal at and disrespectful at worst. You're not on your lunch break, so treat yourself to a latte after the interview, not before. Even if interview is early, or you might end up waiting a long time to get through with it, don't show up with a cup of coffee. The plus side is you won't have to worry about spilling it.