What is this ?? Well it's a very interesting thing I found on the web the other day.
If you have a bitbox please download and run this small (3.1kB) program - it needs sound, not display. (I'll provide the code - which is really not much more than what is in the title .. and some background info soon).
Controls : plug in sound output, also try to press the bitbox button. I really like the 8th one ..
(edit) for those with a linux computer, here is a sdl backend compilation of the same code ... ans a big hint