For three years I worked in a coffee, tea and chocolate store. One day we had a lady in who bought some ground coffee to take home with her, after my colleague had been advising her on which to choose "This coffee is from Angola and is slightly more bitter while this coffee is from Suriname and has a mellower flavour", that kind of thing. The lady selected a coffee, paid, and went home.
A few hours later, the lady came back with an indignant look upon her face.
She addressed me; "This coffee doesn't taste like chocolate!"
Not knowing what to reply to that, I stammered something like, "Indeed ma'am, it doesn't."
"But aren't you a chocolate coffee store? Why doesn't my coffee taste like chocolate?"
After explaining we sold chocolate AND coffee, but only combined them in mochas, and offering her a free mocha so she could taste it, she exploded, yelling something about false advertising (under the name of the store it said "chocolate/coffee/tea", which I guess meant that our coffee and tea had to taste like chocolate to her?) and how she wanted "the bitch who helped me earlier" fired.
My boss stepped in. And that is how we got the first - and to my knowledge still only - store ban in place for something other than theft.