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This guy goes skydiving for the first time.  After he jumps out of the
plane, he counts to ten, pulls the ripcord, and nothing happens.  Only
a little worried, he pulls the cord for the auxiliary parachute, but
unfortunately, the chute still does not appear.  As he is plummeting
toward the Earth, he sees a woman coming up the other way.  He shouts to
her "Do you know anything about parachutes?"  "No", she says, "do you
know anything about gas stoves?"