I've been getting over this cold for about a week now. Ugh. In this bleary state, I can't just sit still and read or watch the television-mo-tron; but I don't trust myself to do anything substantive like work on Perl code. So I noodle around with the ultimate harmless no-consequences environment: PostScript.
And I've been thinking: At the abstract level there's no great difference between "hello world!" in Perl, in PostScript, or in HTML. But even with that in mind, I've recently taken a liking to the idea of a PostScript document that is different each time you print it.
But send this (PostScript, one page, about 10KB) to a printer, and metal parts heat up, chemicals swirl, there's a distant-sounding muffled "foooeee" sound, and then finally motors slooooowly slide out a PRINTED PAGE. Special. Just for you.
(Yes, you can preview in GhostView or whatever, but you know that's just peeking.)
It does everything short of playing a music sting sound-effect. TADAAAAAAAAA.
PS: I've thought of making a PS file that, when printed, just spits out a page of freshly generated pseudorandom digits, handy in many technical tasks. But I don't trust the pseudorandom generators in PostScript implementations to something as important as technical tasks of unknown importance. For that, it's better to just hardcopy a page of numbers from random.org.