It sounds like a cheesy sitcom scene: Man goes into coffee shop. He orders his favorite drink, a triple shot of espresso over ice. Barista declines; he says the drink goes against company policy because pouring espresso over ice ruins the quality of the coffee. Man gets angry. He leaves a tip with an expletive scrawled across it.
That's not even the end of the story. The owner of the coffee shop, Murky Coffee, then writes an open letter to the customer explaining why the barista behaved properly. (It did not enlighten me, though, as to why espresso and ice should not mix. Here is an excerpt: "OK, we don't do espresso over ice. Why? Number one, because we don't do it. Number two, because we don't do it.")