Why do terminals have green screens?

Quite obvious really.  When you have programming to the point
of reaching hallucination, green is a color that makes a great
deal of sense.  Sure, the letters are swimming across the screen
and the person sitting next to you is no longer speaking English
(and is no longer human from what you are able to tell).  However,
it must be noted that green is a perfectly natural color to have
jump out at you and RAM ITSELF DOWN YOUR THROAT AND THROTTLE YOU
AND CHANT OBSCENE DIFFERENTIAL EQUATIONS I
                                          n
    a(squared) b                       yo
     + xy tetragrammaton             ur
            aleph-null, universe       min
  set equal to zero...                     d.

It is at this point where one should stop programming.  Common
sense dictates that if you continue, your program will finally
achieve sentience, and sentience on a green screen is something
that will cause you to start failing your sanity rolls.
                -Jeffy