Apparently my office April Fool's joke was too subtle. I should have done the old trick of taking a screenshot of my boss' desktop icons, setting it as the wallpaper and then hiding all the actual icons in an invisible desktop folder. Or the random fake system errors ("Windows has detected that a gnat has farted within 50 feet of your computer. Please shut down all applications and then restart Windows").
Well, I guess I'll just turn it into a game to see how long it'll take before someone notices that the LJ4100 status display is complaining that the printer's out of chocolate.