Church of emacs Sunday Sermon: Howto

OK, that was the easy version. Now, here's the gruesome details:

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I'm actually finding it remarkably easy to answer this question.
I don't often point people to online game-like interactive thingies, but this one has my endorsement. Give yourself a few minutes to watch the process. It can be gruesome:
This is a bit gruesome so I've put it below the fold.
This is very very cool. A little gruesome of you are not used to this sort of thing. I wonder if it had ant insurance.