This movie may by from the 80s  or the early 90s.

It was a totally crazy, surreal comedy, in which all characters behaved in insane manners.

In one of the scenes, a blonde caucasian bimbo at a hospital makes a shocking discovery that the 2 asian parents who raised her were not in fact her biological parents, but had adopted her. She then sets out to discover her real family. She is assisted by an old doctor, who is crazier than her.