One would have thought the next step would have been to arrange for better (i.e. more metal) elevator music? If it's multicast, it would be surprising if there were a lot of authentication on the speaker side.
``Yeah,'' said Zaphod, stepping into it, ``what else do you do besides talk?''
``I go up,'' said the elevator, ``or down.''
``Good,'' said Zaphod, ``We're going up.''
``Or down,'' the elevator reminded him.
``Yeah, OK, up please.''
There was a moment of silence.
``Down's very nice,'' suggested the elevator hopefully.
``Good,'' said Zaphod, ``Now will you take us up?''
``May I ask you,'' inquired the elevator in its sweetest, most reasonable voice, ``if you've considered all the possibilities that down might offer you?''
Fixed that for you ;)
In the same vein, I often missed the patterns required to solve difficult integration and derivatives in calculus. I believe I need more practice in that regard. Anyone have recommendations for simple protocol reverse engineering practice?