“Laughter cannot be faked, no matter how much good will an audience has toward an author. For an audience, whether it consists of one person or one thousand, shortly becomes a valid one in spite of itself the moment the mechanism of listening starts to operate. Every author, unless he chooses to be willfully self-deluded, carries a Geiger counter in his inner ear that tells him quickly enough whether he has struck the false politeness of hollow laughter or the real thing. There is no mistaking it.”
Moss Hart, Act One