I was sailing with a buddy (a made man in SV) and he asked me what I was working on. I blurted out a one sentence summary and did it ever hit. I hadn't even thought of running through an elevator pitch because I was racing and was really thinking about sail trim. But I remember the summary and I'll use it. I may even lead the pitch with it.
BTW the worst single sentence summaries are the Hollywood summaries: this is Airbnb for Ubuntu distributions. That sort of summary says that you haven't really thought it out. It's a trope and their eyes just glaze over immediately.