Folie à Deux isn't meant to be a joke. But for Australians and fans of Aussie TV, one of the movie's big musical numbers will get you right in your carbuncles for its noice, different, and unusual association with one of the best-ever TV theme songs: Kath and Kim.

"It's a huge disaster, but what is the fallout?” asks one source after the sequel to the $1 billion hit bombs at the box office and is rejected by critics and audiences alike.