Type wc4_chicken at the c prompt then press (during the flight):

ctrl + W to destroy the selected target ctrl + Alt + W to blast the whole thing

1.Start a new game.
2.Go through the first mission.
3.Before the second mission access the terminal.
4.when the grey letters are on the screen before it asks you for your calsign enter:
5.Animal -gets you to a stupid dos game.
6.Chicken -sends you to a stupid new version of the credits with Moe and Bart talking.