I try to do this every time they look harried. Because you know they're angry that the manager hasn't opened up more lines, or worried the people waiting are ma

I try to do this every time they look harried. Because you know they're angry that the manager hasn't opened up more lines, or worried the people waiting are mad, or some sort of anxiety. So being friendly and acknowledging their predicament costs you nothing, but can make their day a bit easier.