The biggest hit of Hong Kong comedy star and director Michael Hui is also considered his best movie, or his next best (after Security Unlimited), by many fans and critics. Having seen an unsubtitled print of this episodic comedy, I can only say that I still laughed a lot at the frenetic slapstick and rapid-fire bursts of rhythmic invention. Hui plays the mean-spirited head of a private detective agency, and among his employees are Hui’s likable brothers Sam and Ricky (1977). (Film Center, Art Institute, Columbus Drive at Jackson, Saturday, March 21, 6:00, and Sunday, March 22, 2:00, 443-3737)