My signature dates back to 2.0.x times, and I've never changed it ever since.
Don't know if anyone remembers it, but there was a player namely hms*miles*egg who liked going around taking others' names and pretend to be them. Me and Aries decided to joke with him by changing to his exact name!! (2.0 allowed that on Windows XP)
Those were fun times, I'm still bummed that this ability (you can call it a bug, I don't care) got removed. S=
My signature used to be just a funny quote from a round of circuit in 2.1. I then later updated it to include some info about where you can find me on other places and to preach about our one true lord and saviour.