How'd you decide on your nickname(on the forums)

I've often used it as my characters names in mmo's (Jubiley if I can't spell it right).
One of my favorite X-men, she shoots out fireworks.
Wow -> I play a Priest -> they gave us penance -> looks like fireworks -> hello, Jubi!
Plus, it means to show great joy or satisfaction...and I consider myself an upbeat person! Happiness makes life worth living and all that jazz.