Don J Password:
Don J is located on a secret island you can't see on the world map.
On the player select screen, press L five times, X, R seven times, X on Controller Two.
Go to the 1 player tournament, the thing where you go around the world to play other people. Start the 1p vs com. mode. When it asks you the question and an option says yes or no, hit no. Continue to do this every time it asks you to play. You will lose every match. Do this until a screen comes up with a guy that has a tennis racket walks into a building. He will be kicked out and the building will fall down.
!!!WARNING: You might have to reset the console afterwords!!!