There's a Secret in My Soup (2001)
Directed by: Yeung Chi Gin
Tagline: "CAT III SHOCKER!"
There is a special rating for Hong Kong movies that is the equivalent of an R in Australia, it is called Category III or CAT III. If you see this on a film it is a warning that the movie is either soft-core porn, or a complete piece of trash made only for exploitative reasons. Of course, if you are looking for this sort of thing, then it is your lucky day!
This movie is supposedly based on a real case. A skull is found in a "Hello Kitty" doll (the doll is pixelated throughout the movie - in some releases they scratched its eyes out), and the events leading up to the murder are played out by accounts from the suspects being interrogated by the police.
I would have to say that this is worse even than Ichi the Killer as at least that movie has really great characters and costumes to distract you from the repulsive violence.
This movie on the other hand, has a scene where one of the characters sticks a sausage on a drill and makes a makeshift dildo and then uses it on a woman. Then he pours oil on her and gets out the electrodes. If this sounds sexy, remember that a cheese grater is also used on a person in this movie.
It is hard to believe that there is actually another movie based on the same events and I have heard it is even worse. Even if you are a fan of exploitation cinema, I would stay far away from this rubbish.