This can be tested!

Kidnap people, place them in a room with a slit in its door. In the room is a magic marker and a slip of paper. They have however long they want to write a name of a co-holder of the NHL record for most points by brothers and slip the paper with that name written on it through the slit, and if they get it right on their first and only try, they get to leave the room.

I predict a valley of incorrect answers between the higher performances of the clued in and the clueless.