When some kind of male witch is disturbed in the process of robbing graves by a vengeful mob holding torches come to kill him, he runs across the road where he is immediately struck by a taxi driver. The driver sees the man under the wheel of his car, but then he teleports in the car seat behind him, apparently now safe from the mob. However, he warns the driver that now they have met, things will not go well for him: he is cursed.
The taxi driver doesn't seem to take much notice, and after all he has a beautiful woman at home, and we are treated to plentiful nudity as we are shown their romance, bathing together and apparently spraying each other with water in another scene. They really don't seem to be asking for much but to be together, but then the woman goes off the man almost immediately, and it is revealed she is cheating with another guy. However, while out with that guy, she runs into a pair of ne'er-do-wells, who eventually rape and inadvertently murder her.
Realising that he was being cuckolded and this led to his wife's death, our taxi driver hero seeks out the witch again, who puts curses on all the people who wronged him. We then get some admittedly striking, often revolting scenes of visions suffered by these characters, such as live worms pouring out of the mouth of one poor actor. They end in violent death, which while not realistically shown - one guy throws himself out of a window and hits the ground in the least realistic impact I've ever seen - are still gruesome and hard to watch.
I believe that toward the end the hero needed to enlist a "good witch" to save himself and others from the increasing madness of the bad witch he'd already contacted, but I'm not sure. Typically for a Category III flick from Hong Kong, the movie lets sense take a back seat in favour of increasingly shocking imagery, which while perhaps poor by contemporary Hollywood standards, is always creative and interesting.
I say check it out.