if you jailbreak your iPhone with PwnageTool from the iphone-dev team, it asks you how large you want your system partition to be.
if you choose 666MB, Stephen Fry comes on your speakers saying, "You have entered the Necronomicus, lair of the beast." after installation, you find you have a ringtone in your default list that is just Stephen Fry saying, "Answer the phone you silly ass! It's not going to answer itself, now, is it? Go on, pick it up!"