I used to have the nick badmonkey (I used to call my daughter a bad little monkey, and she became lil' monkey when I referred to her online, while I was badmonkey) everywhere I went, but it became more increasingly unavailable as the net became more increasingly populated.
When I registered at IGN it was taken, so I just looked around on my desk for something to enter in real quick, as it was just a tosser that I didn't really need to associate with anyway, since I was only registering to do a couple things then leave.
Well...
I never left, and it became one of my first stops any time I went to my computer, so it became my permanent handle just about everywhere, and I have only found it taken once (and I'm not really sure it was taken by someone else, as I probably registered it myself with old information and forgot the details

).
Anyway...
I guess not too many other people out there choose to go around the net named after a battery from a flashlight.
