You know, nakedjoker, MPA's could ask very similar questions:
Like, "I just saw one of my regulars shopping by himself, in the grocery store. Would this have been a good time to ask why he doesn't like me enough to go for the Nude Reverse?"
Or, "I ran into one of my least favourite customers in the produce section at Loblaws, and was inspired to comment on the bag of baby carrots he was holding. The woman next to him, turned as red as the radishes he was holding. Should I have ignored him?"
How about, "My All Time Favourite customer passed me at the mall when I was with my boyfriend and without thinking I waved and said, "Hi sweetie". My boyfriend's cool, but it sure looked like the kids ATF was with had some questions. What's the etiquette here?"