Answer Me This! Episode 68

Episode 68 has the dubious distinction of containing the first question which actually made us almost throw up on hearing it.  See if you can guess which one!  (Clue: it's not the one about ghosts, or aeroplane etiquette, or Edward Norton.)  Then hurry and send your own questions - preferably less nauseating - by calling 0208 123 5877, Skype-ing answermethis, or emailing [e-mail].