I think a lot of people will identify with this post-holiday sugar withdrawal. It's like we've spent the last month doing crack and now all the crack is gone and all that's left is celery sticks and baby carrots. By the way, did you know that baby carrots are a fraud? That's right, a fraud. They are whittled out of full sized carrots. Just so you know.
I've never been a clerk at a grocery or drug store, so I wonder if keeping a poker face when a customer acts weird and self-conscious about a purchase is part of the training. It would be really tempting to mess with people to relieve the boredom. "Does this jock itch ointment work pretty good? Aren't you just dying to run home and slather some on? I'll try to get you checked out as quickly as I can..."