it was late 80's early 90's and was a sort of fantasy/thriller.from what i remember a killer was on the loose,but it was a killer from 'underground'.i think he had stolen some kind of gem,and a sort of foul mouthed gnome was after him to recover it.the gnome teams up with a city detecttive to catch the killer and return the gem.
as i remember it was funny,like a kids film for adults.anyone have any idea at all what it was called?