What I love about them is that they were completely formulaic and artificial. What I love about the film 'Head' is that it came from their desire to satirise their existence as something artificial. 'Head' was released as the tv series ended and didn't do well in the US. They loved it in France, however. It is a fun period piece to watch now. Another film that is a cult classic that's fun to watch is Russ Meyer's 'Beyond the Valley of the Dolls'. The Austin Powers films borrowed heavily from it. Here's one of the trailers: