There is a scene in Eureka Day at the Old Vic during which the audience is roaring with laughter, but it isn't anything to do with the actors who are on stage or what they are saying.
And it isn't a mistake, it is intended, and it's a genius scene for a couple of reasons, how the actors carry on regardless and the relatable source of the comedy.
Eureka Day is the name of a private school in Berkeley, California, which is welcome to all children. That is until there is a health crisis which tests the ideas and values of five members of the PTA.
At first, the play is a satirical stab at the 'woke' left as they debate the appropriate racial groups to reference on the school's website. Everyone is seemingly doing their best to listen, suggest, understand and reach a consensus without causing offence. And it raises a good few laughs.
Of course, the irony is that they are so busy demonstrating what the school stands for and its inclusivity they don't realise the voices they are trying to include are getting stifled.
However, when a child at the school comes down with mumps, the play shifts gear into the debate around vaccines.
Where it gets very funny is at an emergency meeting about what to do, conducted via live video call with the rest of the parents. The PTA are huddled around one laptop, remaining polite and respectful to each other's views.
Then on the back wall of the classroom set, the comments from the video chat start popping up.
At first, it is a mixture of gossip, random remarks and polite comments about vaccines, but it soon descends into chaos, a mixture of wacky ideas, passive-aggressive comments and plain insults about each other's views.