I work in the theatre and cinema. We constantly remind people that filming and photography is not allowed. In the cinema a message reminds people to turn off their phones. If there are latecomers we try to let them in a suitable interval and put them in the nearest available seat so as not to disturb other patrons. They can find their correct seat in the interval. Noisy eating in cinemas and theatres is a distraction and just plain bad manners. This is why we try to sell ice creams if people need a treat, a silent non rustling snack. Cooked food is not allowed because of the smell. If someone needs the loo, then unfortunately there is nothing we can do except maybe tell them that they will have to wait to come back in at a suit time if it’s the theatre. People who know that they have bladder problems should consider booking end of a row seats so as not to be a pain to other audience members. Also, standing up in a musical and singing along is not allowed generally during the performance as those sitting behind you will not be able to see the stage, but at the end, during the encores and applause, that is acceptable. People should be taught theatre and cinema etiquette, as listening to someone noisily eat is just so unpleasant and disgusting. I have seen people come to the theatre and sit looking at their phones for the whole performance, I ask myself why have you come in the first place!