Holy isht! I have heard a variant of this story as well! A pioneer sister in Massacheezits (Natick area) was preaching in a well-to-do area and she happened to come upon the door of a high ranking U.N. official. When she preached her message the official got angry and said, "If only you knew what plans we have to deal with YOUR religion." and slammed the door shut.
I never knew there were so many variations to this story!