Not sure if I have responded to this thread or not but who cares. Mine comes from drunken night of Halo LAN and my favorite band. One night my buddies and I got together for someone'e birthday at my house and hauled over a couple of TVs and another Xbox. 4 on 4 capture the flag was the game on Sidewinder. I had had quite a few beers at that point and was pretty out of it. I was helping protect the flag carrier when I heard one of my friends yell, "Who is that that shifty sonofabtich?!" A light went off and the next break we took I changed my username to Shifty. Then when I got XBL I needed to add to the name because there was no way in hell that just Shifty was going to be available. So I looked around the house trying to decide what to add to the name when I looked at my CD rack. I took the first album name, which was Undertow by Tool, and threw that on the end and came up with Shifty Undertow. This was a couple of months before Halo 2 came out and it was also my original Bungie.net username. Then when Halo 2 came out I decided I wanted to change it to DisturbedShifty which is my favorite band coupled with the drunken Halo name.