I'll keep the difficulty in mind for the next one. :) My students average around 26-28 points; the highest score so far has been 35.
They know a lot of the characters.
I do give hints for some of the harder questions, like the distance from the Earth to the sun. Also they need some help with the Friends theme song. (Also, I'm from Hawaii so the southernmost state in the U.S. is kind of a gimme to students who are paying attention.)
K-pop is probably the hardest section since they have to change English back to Korean.