I was invited to lunch near factory 541, tank city, a pseudo closed area sprawled in some Shanxi valley. Turned out it was lunch and a show, they were going executing some drug traffickers from strike hard. Impromptu don't do drug lesson from uncle. We had to turn around because I had naturalized western citizenship and weird dialect by then and they figure security would not let us through. It was pretty surreal experience vs how nice and insular danwei life was otherwise.