First off, let me say that "The Devil" is the feel good movie of the year! It's a roller-coaster ride of thrills and chills! It's a triumph of Chinese Cinema!
After watching this film, I can honestly say it is probably the finest example of Hong Kong gore. I suspect there's actually no plot to this thing--not that it matters. If you like to see one gratuitous scene after another of people vomiting snakes, worms and maggots, then this film is for you! Oh, there's plenty of erupting boils as well. And a rather fey Chinese boy dressed like the long-lost miniature Asian member of the Village People. His name is (and I'm not making this up) "Ding Dong." Mere words just cannot do this masterpiece justice.
Sell all your worldly possessions and go see this film NOW!!!!!