This, I think, could qualify as a joke.
Years ago I came across a classified ad. I don't remember where I saw it--it might have been the National Enquirer, it might have been one of the home mechanics & technology magazines--but this is what it said;
How would you like to receive several hundred
envelopes each containing one dollar? Send $1 to
(The Address)
Now I'm not always quick on the uptake, and I didn't send away for it myself--but it occurred to me in about two to three seconds that if I did send in a dollar, the answer would be a note like this;
If you want to receive several hundred envelopes each
containing one dollar, post an ad in the classifieds saying:
How would you like to receive several hundred
envelopes each containing one dollar? Send $1 to
(Your Address)
If anyone tries this in real life--let me know how it goes.