(YouTube Link)
This floppy disk drive has been altered to play the Darth Vader theme from Star Wars. I have no idea how, but here's an explanation floating around the blogosphere:
I can't find any documentation for this, nor can I help posting it. I assume it's a hardware hack that manually controls the floppy drive's stepper motor, but it'd make my day if this was done in software using standard I/O requests. Either way, the 3.5 inch FDD finally serves an important function again.
Link via Have You Seen This?
http://www.haikuware.com/directory/view-details/drivers/audio/floppymidi
-matt