People that don't have the common courtesy to ask for things politely. I work in a restaurant, and over the weekend I had all sorts of people either bark "RANCH!!!" at me if they wanted some more ranch dressing or "BREAD!!!!!!!" at me if they wanted more bread. Instead of, you know, being civilized humans and saying, "Hey, do you mind getting us some more bread?" or, "Could you please grab us some more ranch dressing? the six ramekins you gave me just ISN'T enough for this side salad."