"I don't work here lady!"

It's an all too common phrase we have to say to people displaying Karen-like behavior, since they have a tendency to latch onto the first person they see, logic be damned. 

That's what one guy wound up having to say to a woman who came up to him in an Aldis, demanding to know where the candy apples were. Having just helped someone else find some apple juice, the woman assumed the man knew the store inside and out. Of course, he didn't know, but she refused to accept his answer. When an employee did finally arrive, the candy apples were revealed to be a discontinued seasonal item. 

Read that story, and plenty of others from people demanding things from unlucky non-employees.