I've seen some pretty ridiculous ones, but I don't really care about usernames, tbh. Whatever people choose to be known by, let them be known by it. :p I [i]do[/i] recall one time seeing a screen cap on the Halo: Reach file share where they were playing a match of Infection, and two users were called "THE_WORLD" and "AIDS." As you can imagine, what came up on the kill feed... "AIDS infected THE_WORLD" Priceless.