Reminds me of the old Bevis and Butthead episode when Beavis was taking a lie detector test. It went something like this:
Cop: How much is 2 + 2?
Beavis: Heh heh 5.... the light blinks green indicating correct answer)
Cop: Well, since you think it was the right answer...
So if I though I was spelling it right does that mean I spelld it wrong?
This is the tool:
http://www.flickr.com/photos/eoorider/5286283005/