What is wanted:
- short TeX, MetaFont or MetaPost macro/macros (half A4 page or half a screen at most),
- the code should be generic, potentially understandable by plain–oriented users,
- results need not be useful or serious, but language–specific, tricky, preferably non–obvious,
- obscure oddities, weird TeX behaviour, dirty and risky tricks and traps are also welcome,
- the code should be explainable in a couple of minutes.
