I actually don't look at usernames while reading posts on message boards. I surf the web at work on the downlow and don't use the whole screen, just a small window. So I only make the window big enough to read the post text, not the screen name of the poster.
I tend to use one-word names that are just a typical word from the dictionary, and make it personal to me. I've been Hijinks for years because no one ever thought to use the name, I guess. I've always been able to get it. Until I started posting like a fiend in the Vanguard: Saga of Heroes forum a year before the game launched, and then suddenly there was a Hijinks on every server, it seemed (grr).