Rollercoaster chess
Basically, xkcd is a comic site, by its own description, "of romance, sarcasm, math, and language". Extremely funny it is too, and that blog post I linked to is based from one of the comics.
Doing that has made my list of "things I need to do before I die", along with "play a theremin" (which may actually happen, because my friend is building one), "build and fire a railgun" and other such things.
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