The NYC Resistor hackers have installed an MP3 player in a decommissioned training hand-grenade, because they could, and because it is the kind of deliciously bad idea that is hard to resist. Receipt of the grenade in its shipping box occasioned something of a stir at NYC Resistor, it appears.
mp3 grenade in it's final design glory (via Make)
There was much fear and freak out. But cooler heads prevailed and a phone call was made. "Hey Matt, did you order metal objects of a dubious nature?" "Yes, yes I did." There was a great deal of internal strife over this particular event as ordering munitions to the space is strictly forbidden. Upon review and discussion it was decided that while purchasing decommissioned training grenades was not in fact illegal in NYC (as far as we know), it was not something we would ever do again. That being said. I immediately set forth on a childhood dream project. I put an 1/8th inch jack into the pin hole for the gr3nade. It looked GOOD. Totally flush... very pretty. So I decided to run with it. I ran the cabling into the gr3nade... hacksawed it open. Inserted a Sansa 2 GB mp3 player. And then tried to SMD rework it. This ended poorly as the first sansa basically got burned by the rework station and died. The second I avoided using the rework station and instead recruited bre and his arms for a session of intense soldering onto very tiny solder points.