I really hope that's not real and that no one is actually that stupid, though sadly I wouldn't be surprised if it were.
You know, I worked for the production team of the Dutch version of Who Wants To Be A Millionaire, and was specifically assigned to make sure there would be good candidates every show.
We did small tests by phone, and erm... I'm ashamed to say A LOT of people are actually that stupid. We usually asked one 'open' question, like: How much does a Boeing 747 jumbojet weigh? Some even answered stuff like: About the same as 4 cars? 1000 kilograms?
I think the most ridiculous one was to the question: How tall do you think the tallest man ever lived was? Someone said 45 meters.
By the way, don't spread this information too much. I could get sued.