The Microsoft certificate of authenticity on their more high-end products is pretty cool. All those water marks, and microprinting, and heat sensitive ink. Cool stuff. Maybe a little overkill on Microsoft Chewing Gum 2000. That reminds me, I need to download the service pack for Gum 2K. It patches the security hole that lets 10cm high green cyclopes inhabit your molars, and fixes the flavor module that gets stuck on Peaches and Guano until its rebooted.