What An Incomplete Crossword Puzzle Says

Yesterday while on a flight from Miami to Chicago I flipped through the in-flight magazine and the crossword puzzle caught my eye.  Only two words had been filled in.  "Kant" in the top left, and "Jon Bon Jovi" in the bottom right. The rest of the puzzle was entirely blank. What had happened there, I wondered. Had a prior passenger been stumped by all the other clues?  Could there really be someone out there who knows a lot about 1980s hair metal bands and 18th Century German philosophy, but nothing else?