While in any map, hit the Tab key to enter the message box. Type in the message box "remember roswell" and you will recieve the message "SUE, may she rest in peace." In addition, if this code is done on the Memphis map, a small rabbit will appear before the player and jump around the screen, dropping useful modules like Combo, XRay, and Teleport.

Code - Effect
remember roswell - Secret Message and modules on Memphis.