CreditsStart and quit the game.
In the credits, wait until it goes to the second to last picture, or the one that says "It would have take 25 years for a single person to create Atlantis."
Below that, it will list things like "950 working cds", "16483 different polygons", etc.
At the bottom, it will say "136357 cups of coffee".
Wait a couple of seconds, and then watch the 7 at the end of the number turn into an 8. Information also contributed by Itay Shahar