Kakabakaba Ka Ba?

Kakabakaba Ka Ba? is a 1980 Filipino musical comedy film directed by Mike de Leon from a screenplay he co-wrote with Clodualdo del Mundo Jr., and Raquel Villavicencio. The film stars Christopher de Leon, Charo Santos, Jay Ilagan, and Sandy Andolong as two pairs of lovers who accidentally find themselves in the middle of a conflict between rivaling Japanese and Chinese drug syndicates. It also features Apo Hiking Society members Boboy Garovillo, Danny Javier, and Jim Paredes, Johnny Delgado, Armida Siguion-Reyna, Leo Martinez, and Nanette Inventor.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.