lol that's a good one. You'd be surprised to see how many people visit http://www.rakkoon.com/error.asp (mature language is used on that page. Visit and read at your own risk!) because of people searching for phrases like "page cannot be found"
I rather like this one, on my site (note I did not create or come up with the idea) Be warned, I would give it a bit of a mature language is used on that page. Visit and read at your own risk! label too, but its still funny.