The reason I ask is because several years ago I helped build a house way out in the hills of Tennessee, a big house on a bluff overlooking the Cumberland River. Once or twice a week, a helicopter, painted jet-black, with no markings whatsoever, would fly low over the river late in the afternoon. I remember thinking, "hmm, they do exist," but never giving it much more thought.
Years later, enter sdnet, and people joke about black helicopters here. I've never heard any speak of them in anything but a joking tone (here or elsewhere), and was curious about the origin of the humour.
TIA
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