a men is killed by drowning in the toilet, filmed from the toilet

I'm looking for a movie where there is a scene in which a men is murdered by drowning in the toilet, filmed from the viewpoint of the toilet, looking upwards on the guy's face till his dead. I believe it's part of a series of various killings.

Sin City?
The guy isn't killed though.

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No, it isn't Sin City.

There is a scene in I Spit on Your Grave 2 where a guy is drowned in a toilet. Don't know if that is it or not.

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You are no Vader. You are just a child in a mask.

Not "I Spit on Your Grave 2" either.

I believe the movie you're looking for is called Flushed Away

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nice one, mate.