Bobpha Chhnas Bah Kou Ba (1985)

Asprin and Strepsil, two petty thieves, inadvertently become involved in a murder case when they steal items belonging to a murdered man. The man had hidden an important microfilm in his passport, which the thieves passed onto a forger friend Panadol. Inspector Ng is assigned to the case, along with Inspector Morris from Scotland Yard. The investigation leads the cops to the bumbling crooks, and soon they are on Triad leader Tin’s tail. He will stop at nothing to get the incriminating film back, and with his hitman and bodyguard at his side, he proves too much for the inspectors to catch using legal means, in frustration, they give up their badges and go after Tin alone.