I just stumbled across this thread when looking for something else and now am once again fascinated with whether or when this judging rarity has ever actually occurred. For anyone who hasn't seen the thread before or has forgotten, the debate was whether a second player could get away with last name only after the first player to ring in supplied an incorrect first name, and the key being that first name would not normally be required for the response. Can anyone recall another instance of this in the nearly 3 years since? Econgator's seppuku is still at stake!
I actually found a very close call, but I think it's arguable as it seems very possible that the first player would have been prompted for first name as well.
http://www.j-archive.com/showgame.php?game_id=5528
Opera $600: Aussie Helen Mitchell changed her name to this & became the toast of the opera world
(Henry: Who was Helen Melba?)
(Jack: Who was Melba?)
(Alex: Be more specific...we're looking for a first name.)
Dame Nellie Melba
There are several instances in the Archive of them accepting Melba without requiring Nellie so it's not a guarantee that the first player would have been prompted, but since they were specifically asking about her name change it's possible that they did intend to require first and last. Only Alex's paper knows for sure!
I did a few various Archive searches on terms such as "incorrect first name", "be more specific", "too much information" and looked through hundreds of clues that popped up in the searches, trying to find a smoking gun example but I've still yet to find a clear-cut case. Where oh where is cheezguyty?