In Windows Xp Games:
Pinball:
Start a new game of pinball. When it is loaded, write "hidden test" (without the quotes). Then click and drag the ball anywhere you want within the table !
Solitaire:
Press Shift+Alt+2 anytime during the game to win !
In Spybot Search & Destroy:
If you click on the binoculars icon while running a scan, you will be presented with a game that you can play while the scan is running.