Fight Back to School (1991)
Fight Back To School is a 1991 Hong Kong comedy film directed by Gordon Chan and starring Stephen Chow. The cast includes Cheung Man and Ng Man-Tat. Owing to this success, the film spawned two successful sequels; Fight Back to School II, and Fight Back to School III, as well as a spin-off Truant Heroes, which retained much of the cast.
More at Wikipedia.