Back in 1977 I was an Antarctic expeditioner living with nineteen others on Macquarie Island. We were to be there a whole year in complete isolation. We had accommodation and supplies enough for the year but not a lot more than that.
It was April Fool's Day, and being a former ex Royal Australian Navy radio operator (and also a radio operator now on Macquarie Island years later) I made up an imaginary message and addressed it to our OIC. It looked very convincing.
In effect, it stated that the RAN's hydrographic frigate, HMAS Gascoyne, would be visiting Macquarie Island and staying over for a week.
There was a request (really an order) Would we be able to supply the Gascoyne's crew (100 men) with such things as food, temporary accommodation whilst some ship's repairs were being done and many tons of diesel fuel. (our 'life's blood, for we used diesel generators for our electricity)
Added to this, I stated that it had the firm approval of the Antarctic Division Headquarters and the OIC would be expected to comply.
Well! Our poor old OIC! He was aghast.
I didn't have the heart to keep in in such agony, relenting after a few minutes to tell him I'd made it all up.