I don't get it, what's so funny?
On the first question... Not everyone knows how to pronounce the name properly, especially if you're not into Greek mythology. Also he's obviously very excited, could be a reason why he pronounced it wrong...
Secondly, what makes "the world's fastest car" a stupid answer? I've never watched this show before so I don't know how it works, do you get any clues before you answer?
The most obvious stupid answer to me is the last one, I could figure it out instantly and english is not even my native language...