I used to live dangerously--writing scripts that used themselves as data, then destroyed themselves after doing their dirty work. Sounds like illicit activity? Not on your life--just a way to cleanly install something on a massive remote basis when silly rules constrained me to one file, which I could only execute--I couldn't, for instance, send a tarball, pop it open, and then do the install. (Those rules cared about number of files and not actual bandwidth.)