I was reading about _Diamaond Ninja Force_ in Video Watchdog_, which
is a splicing of ninja scenes into a HK _Poltergeist_ parody involving
an evil witch. In one scene, the witch tries to kill a kid by forcing
him to eat handfuls of grass. She also also spirits herself into the
wife's privates in attempt to sscrew the husband to death. The
writers of the article didn't know what HK film these scenes (and
the bulk of the film, save the Tomas Tang ninja scenes) came from.
Since there has been a lot of scholarship in HK cinema (not to
mention it's becoming available by the truckload), I figure somebody
on here might know what the original film is.
Screen-L is sponsored by the Telecommunication & Film Dept., the
University of Alabama: http://www.tcf.ua.edu