Shampoo is a tour-de-force of a movie more with the acting from Warren Beatty, Goldie Hawn, Julie Christie and Lee Grant, who took home the Oscar for Best Supporting Actress, than the screenplay, written by Robert Towne and Beatty (Oscar nominated).
Demon Seed is more goofy than scary (but that might be how it was meant to be) but still is rather entertaining and in keeping with a film from the mid-70s.