Prepare 3 Envelopes

I'd package them like Matryoshka dolls, to explicitly force ordering, since it seems it is relevant in messages.

If I remember right, this joke is also told in the Hollywood drug-flick "Traffic", from 2000 or so. In the movie, the burnt-out drug czar of the old US administration mentions this joke to his ambitious successor, played by Michael Douglas.

First heard this as a Kruschev/Brezhnev joke.