Writing minimal HTML pages to test dark corners of CSS is far and away the best way to learn the box model, alignment, and so on.
miniblog.
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Playing with my elisp grammar has exposed some interesting corners of the syntax that I haven't seen before.
This is a legal character:
?\C-\M-\S-\H-\s-\A-i
Actually pressing ctrl-meta-shift-hyper-super-alt-i might be a little challenging though :)
Dark, unsound corners of the Haskell type system: http://t.co/9JrcMtQ4co
The difference between a good API and a great API is largely down to the behaviour in the dark murky corners.