Rowdy audience members have disrupted performances with heckling, violence and even copulation in the stalls "Speak clearly and don't bump into the furniture" " so goes Noël Coward's timeless advice to actors. But for those treading the boards of London's West End this weekend, there is a new peril: rowdy, smartphone-wielding audiences. From heckling and screaming to livestreaming and even copulating during shows,…
