"... what he's pretending to do on screen"

I remember seeing this discussed around the show The Marvelous Mrs Maisel, which is about a midcentury NYC divorcee getting into the world of stand up comedy. Overall it works and is a funny and enjoyable show, but there's definitely some of the standup routines depicted on-screen that are not actually as funny as the baked-in audience laughs might indicate. Because yeah... you can't really fake delivering good standup, even with a whole writer's room preparing the jokes and all the editing magic in the world, you still have to actually stand there and tell them in a funny way. That part can't be faked.