It happens to me on a weekly basis. I’m teaching a class on how to write User Stories. Usually it’s part of my Product Owner workshop. We’re happily writing stories for an iPad application simulation. Typically halfway thru the exercise someone raises their hand because they’re struggling with the format of a purely technical story. Quite often they don’t know how to frame the “user” clause and are stuck there in their writing.
My first recommendation is often to tell them to skip it. I tell them that the “As a” and the “So that” clauses are usually quite different for technically related stories. I just ask them to quantify the need (technically), in clear English with perhaps a couple of sentences, and then move on.