A little Scanner Music?
I guess this scores highly in the "Cool but Useless" catergory! If you have a HP 3C or 4C scanner, you can make it play music.
The scan head has a variable speed stepper motor, and it can be moved at different speeds, producing different tones.
To see and hear a video of a HP scanner playing "Fur Elise", click HERE!
Could it be thast some folks have WAY too much time on their hands?
Hat tip to Slashdot and Hackaday.com for the story.