Abracadabra (1986)

Original title: 天靈靈．地靈靈

In 1980, a crack team of Taoists (garbed like ninjas!) successfully vanquish a mob of ghosts -- except for female demon Pinkish Red, who manages to escape. Six years later, Cici Shin (Charine Chan Kar-ling) and her cousin, Lily Li (Ann Bridgewater), open a boutique and need a mirror for their fitting room. The mall security guard finds one for them in the basement but, naturally, Pinkish Red resides inside it and, when Cici cleans the mirror’s surface, the ghost is able to enter back into the real world.