Everybody knows not to leave cell phones on at a concert. Or at least everyone has heard reminders before concerts. What could have possibly created such a disturbance before the noisy things were invented? Here’s a note printed on the front of the Glyndebourne program of 1935: “Patrons are earnestly requested not to flash TORCHES during the Performances. It is aggravating to the rest of the audience but intolerable to the Artists. It is much worse than ‘walking behind the bowler’s arm’ at cricket.” Now that we know that, what annoyed audiences before the invention of the flashlight?