I remember reading somewhere that most laugh tracks were recorded in the 50’s and most of the people laughing in them are dead. which totally makes sense because no living person would laugh at the big bang theory.
"Like Belyaev’s domesticated foxes and, like the domesticated wolves that we call dogs, have we become the tamer, more lovable, with the human equivalent of floppy ears, soppy faces, and wagging tails? I leave you with this question and move hastily on."
— Richard Dawkins-The Ancestors Tale