On the trail of generators (that's definitely recommended reading if you ever use Python or process XML), I happened on a dissection of SNOBOL. The code sample is, um, interesting. As the author says,

Snobol 4 is a dead language in the same sense that Latin is a dead language. i.e. there are still folks out there who use the language in various ways.
...
Snobol 4 was a testbed for new ideas. Some of these ideas, like the near total lack of control structures, didn't work out.