On Sun, 8 Aug 2010 05:05:50 -0700 (PDT), a wrote:

.. Remember, fellow aviators, there are demons
lurking near the edges of the envelope.


Or as my first flight instructor told me, "The envelope has airspeed
going horizontal and altitude going vertical. Pushing the envelope
puts you into the upper right corner of the envelope. That's also
where the stamp gets cancelled."

Jim