Back when I was about 14 my username for everything was CrmsnAbyss, because you know, I was a kid and everything had to be dark and creepy.
Well, my boyfriend at the time had his sister staying over at his house and she made a comment about how it reminded her of a "womans time of the month."
Well, suffice it to say, I had to change it to this username. It took me about 30 minutes to come up with it, but I liked the way it rolled off of the tongue and Paranoia has been my favorite word since I was little.