Forbidden City Cop

Daai laap mat taam Ling Ling Fat is a movie starring Stephen Chow, Carina Lau, and Carman Lee. A wild and hilariously anachronistic tale of an imperial guard of the Forbidden City who has no martial arts abilities but a talent for...
An imperial agent gets ridiculed for his various inventions, until his supportive wife encourages him to attend a conference, which's actually a trap to kill all the doctors serving the emperor, where his crazy inventions come in handy.