You can tell by the look on everyone's faces, at least on the feeds from the newer cameras with better PTZ capability. It's like a silent movie. After a while you can tell no one's happy working here. Tell tale signs are hand to forehead, pursing the lips and exhaling, shaking of the head, shaking of the fists, rubbing the temple or forehead area, walking fast with head down to the floor, and yes, crying. I have seen a few stores where an employee goes to a "hiding area" to cry. I've seen another store where a guy punched the wall in frustration.
To tell the truth, this is sad.