Alt text: a text post that reads:
Work in retail long enough, and you'll eventually realize the rules for dealing with Customers are exactly the same as dealing with the Fae:
Avoid eye contact.
Never reveal your full name.
Accept nothing They offer you.
Never verbally agree or disagree with anything They might happen to say.
To apologize is to acknowledge a debt owed.
Under no circumstances are you ever to thank Them.
Remember that They are incapable of reading signs in human languages.
The key is to know which rules to break with which customer though. That's the hard part.