Use the following trick to have your Sim get abducted by aliens (the icon is a green saucer). Buy a telescope at the "Buy" menu and select it. Choose the "Stargaze" option. Note: The "Spy" option will not work. Suddenly a light will appear from the sky and your Sim will be abducted. A few hours later, the Sim will return. If that Sim has a job, do this on Saturday or Sunday to avoid missing work.
While at home or on a lot, press L(2), R, X(2), UP. Then, activate the following cheats by entering the corresponding sequences of buttons during gameplay:
CHEAT FUNCTION - CHEAT CODE 10,000 additional Simoleons - UP, LEFT, DOWN, RIGHT, R. An option to advance time by six hours will now appear on the Cheat Gnome. Select the Cheat Gnome, then cancel the selection. Press UP, LEFT, DOWN, RIGHT, R again. A "Give Sim Simoleons" option should now appear. Pet Points - TRIANGLE, Circle, X, SQUARE, L, R. A "Pet Points" option will now appear on the Cheat Gnome. Pet Emporium fully UPgraded - RIGHT, DOWN, RIGHT, UP, RIGHT, DOWN, RIGHT, UP. Advance time by 6 hours - UP, LEFT, DOWN, RIGHT, R.