Check it out Here!
Actually there's a good reason for doing this, my website server crashed many moons ago, and I really need to get all that data back online. I was looking at the error logs to see how many folks are hitting me and going away and I was struck by the fact that I'm throwing two errors for each bad page.
One for the page and one for the missing error page so it has to display the default one.
So this is cutting my error logs in half!