> I don't know whether it's still around on the Net somewhere, but > several years ago someone posted a file named xii.tex > When processed under plain TeX it output the familiar "Twelve Days of > Christmas". ctan macros/plain/contrib/xii.tex > But the author, whose name I've forgotten but was a well-known > TeXpert, had managed to conceal all this under a maze of obscurity. david carlisle. he didn't want it preserved for posterity, but i persuaded him to let me put it on ctan. > Anyone wanting to try their hand at writing something to parse TeX > should see how their program works on xii.tex i can hardly parse the thing as a gendanken-experiment, using my own brain.