14. Cutting in line for any reason
A queue exists because in this grand scheme of things, there has to be order. You are not to cut in line for any reason – not to just buy a gift card, not to ask for an extra shot of espresso because you changed your mind, not unless you want extra hot coffee thrown at your face.
15. Asking, “What’s good?”
Unless you’re Nicki Minaj and the barista is named Miley Cyrus, don’t ever use that line again.