The Null Device
Not that long ago, a joystick-shaped device named the C64 DTV, containing a Commodore 64-compatible computer (developed by Jeri Ellsworth, who also created the C-One super-C64) and 30 games, appeared on the market. Hackers who bought these are now opening them up and adding things to them; for one, it is possible solder on a PS2 keyboard (unlike the original C64, this one speaks the PS2 keyboard protocol) and, indeed, a standard Commodore serial bus connector for plugging in a drive (photos here); alternatively, one can embed a DTV inside a working Commodore floppy drive. With a keyboard and storage, the diminutive box (costing US$20, or about 3 times as much in the UK) becomes a fully usable Commodore 64, except for a few additional augmentations, such as a video chip capable of 256 colours. And there is more information on undocumented features of the DTV here.
Found whilst looking at the Wikipedia article on Jon Ronson: the First Earth Battalion Field Manual, as mentioned in The Men Who Stare At Goats. Imagine an artefact from a parallel universe or a Robert Anton Wilson novel where, for a time in the late 1970s, Timothy Leary ran the U.S. Army, and you'll have some idea of what it is.
(via "Jon Ronson")