Before dawn at work once, I pointed out the planet Venus to some co-workers. One guy became very adamant that not only could you NOT see a planet with the naked eye, but furthermore the object in question could only be the North Star because it was the brightest light in the sky. Logic made no dent in this idiot even when others pointed out that "if it's the North Star then why is it rising in the east". It just goes to show that you can't fix stupid.