I work in a psychiatric hospital so this show hits the mark in many ways (for me). When I get patients in the hospital who are very labile, I have seen a person laugh for hours, only to then turn to crying, then scream and yell nonsensically, then back to calm......
I see perfectly happy psychotic patients alot too......just laugh and talk to people who do not exist except in their own mind.
I have a patient who talks to "Daddy" everyday...daddy is God and she is his daughter(according to her).
I guess you could construe "mad" in many different ways, but when you see someone, who for lack of a better term is "mad"---none of it makes sense---but it is the reality of that person and when they are sick and not medicated (and even after they are medicated). Trying to convince them otherwise is challenging.