Revisiting Hong Kong action comedy horror mashups reminded me that the first Mr. Vampire film featured the debut of actress Moon Lee. She was a professional dancer who was recruited by director Ricky Lau for a role because he wanted a "fresh face" for the part. She starred in a lot of action films in the 80s and 90s, and she was in another schizoid HK genre film directed by Lau,
Nocturnal Demon where she plays Wawa Choi, a gal from the mainland come to Hong Kong to visit her tow-truck driver cousin and blind grandfather. Unfortunately for her cousin (Albert Cheung) there's a psycho, box-cutter wielding, lighter fluid-sniffing cab-driving serial killer (Wing Cho) on the loose he bears a resemblance to so he has the cops and the killer after him. Talk about mood swings, the movie starts up with the killer driving his cab, getting stirred up by a provocatively dressed female passenger, and his stalking and murdering her. Then you'll have scenes of wacky comedy and "naive country mouse in HK who happens to be a skilled martial artist" antics with Moon Lee, and slapstick and more culture oriented jokes about mahjong, Chinese medicine and Cantonese wordplay that may or may not translate well, if at all. I think years of exposure have caused me to build up a level of tolerance for this sort of thing in HK films from the late 20th century.
One reason you saw so many weird genre blends in this period was that in HK a film could be in theaters for a week on average and needed to appeal to all sorts of viewers to get noticed, hence a lot of filmmakers throwing in as many elements as they could, and it's not the only "wacky movie featuring a serial killer" of the time. So you have fight scenes, choreographed by veteran Yuen Wah, who has a cameo as a jewel thief who runs into Lee, and the final conflict with the killer, who is martially inclined while Wawa's cousin is...not. And for the final conflict, Lee dresses like a potential target for the killer, complete with big-hair wig and vinyl.
But hey, this movie was an HK box office hit in 1990.