Those were not actually errors but a form of Hacking. Google used to rank pages depending on how many other pages were linked to them. One could take advantage of this. And that's actually how stuff like that happens.Just like when they have those "errors" on google searches if you search for something like "George W. Bush" and it gives you some custom error message/joke thing. Anyone know what I'm talking about? They usually aren't up for long though.