Unique and maybe needed to identify us if we go missing so I suggest we all get these tattooed somewhere discreet. Bit of fun here or make a little pressie,
Whilst going through a bit of a metal stage, I did briefly consider getting a barcode tattoo. Then about 5 of my mates got them and suddenly it just didn't feel right. ]
Ok, geekwarning but Data matrix codes are way cooler. You can encode any message in this kind of image (using sqaures representing zeros and ones) and anyone can decode this message. Check out http://www.2dcodeme.com/ or http://www.stickybits.com/