Is it acceptable to talk during the trailers? My friend is unequivocally of the view that being able to stream movies at home has turned us all into animals, with etiquette amnesia. I, on the other (waggling) hand, think that as long as everyone shuts up when the film starts, it’s OK. In the unlikely event that the previews were the crucial deciding factor in booking your tickets, you can always Google and see them again the second you leave. It’s fine.