Casanova gets big money to deliver a small jade statue. He is awake all night, nervous. On the road he encounters two odd water buckets and I don't get it. He delivers the box unopened with the jade inside but it is now a rock despite never having been out of his hands. He loses his business for losing the jade.
Cut to a casino and two new guys and a girl and something about cheating. Casanova is in the casino, moping. The gambling guy explains how the jade was switched. They make a plan to get even and need new clothes. They go to a jewelry business to do their plan but find people killed and a hostage situation. The others want to take the old guy and make him reveal Liang's whereabouts. Our guys make off with him instead. They try to make a deal with him but a passerby kills him.
They meet Beggar Su and he becomes their master. Casanova has been crazy since his second scene. The two guys take him to a brothel to find Liang but he no longer recognizes his enemy.
Meg Lam Kin-Ming is in this movie. In Sammo Hung's "Dirty Tiger, Crazy Frog" she played the unforgettable multi-handed chick. This is a martial arts comedy but two things I did not find funny were Casanova's "insanity" and the segment in the brothel.
Other reviewers have called this Casanova Wong's best but I disagree. The final fight is fabulous but overall I rate the movie just a bit above average for the year and genre.
My copy is a digital file. It is dual English and Chinese hard subtitled and widescreen with excellent resolution so I suspect the original source was a laser disk.