What were originally ad lib responses from the audience are now as tightly scripted as any screenplay, and audience members who provide "incorrect" responses are angrily shouted down just as if they were being disruptive in a normal movie
Is this really true and commonplace these days? ( I've understood that part of the enjoyment is to hear new callbacks from groupies who are, say, visiting your theatre from another side of the continent. The etiquettes I have seen caution against discriminating new groupies - after all, the show is supposed to be about having fun.