I'd like to suggest a new entry for the Employee Manual at Home Depot (a large USA hardware store).
1. If a customer comes to the checkout area toting a toilet auger, a pair of knee-high rubber boots, a mop, two gallons of bleach, elbow-length neoprene rubber gloves, a scoop shovel, and a gallon of industrial-strength deodorizer, it is not neccesary to ask him or her, "So, how are you doing today?" Nobody really wants to know.
2. After said customer tenders cash for his/her purchase, please use an antibacterial hand sanitizer.
[Inspired by true events.]