Psychologists have made a list of the most annoying workplace habits. Topping the list: talking too loud or whispering.
Also, complaining was a big "complaint" among co-workers surveyed. Saying "excuse me" in response to every comment or question and walking around bare foot gets under the skin of co-workers, as well as interrupting. Heating up smelly food in the microwave is another big one. Other habits making the list include: co-workers who correct people too much, micro-managing, and chewing gum with your mouth open.