I remember reading somewhere years ago that certain militarys (think Israel and the US were two of them) used speech synthesis technology to do things like give false commands over radio to enemy fighters.
Would be impressive considering the state of the art that I know of[1] would not be able to fool anyone. I find the truthfulness of this statement questionable, especially when they could have done it more easily by having someone issue the false orders. Or maybe they pieced together several real samples to issue a full command?