There’s no business like show business...just ask Bertie
Then stand well back while they rant about the witty line that gets a titter from Monday-nighters as opposed to a full-throated roar of laughter from theatre-goers at the end of the week.
Monday-nighters take a neutral-to-negative, "Prove it" stance. Saturday-nighters are positive, take the point as already proven and just want to celebrate the wonders of the play, the performance and their perceptiveness about both.