In the film Ernest Goes to Camp when the Cheif was speaking seems to have been using real Plains Indian Sign Language based on the Wikipedia article for the mov
your-job-in-germany
haywire
thriller-tv
hong-kong-1952
a-time-to-kill
santa-claus-is-coming
knight-rider
hellraiser
dreams
hugo
under-the-skin
monkey-kingdom
yellowbrickroad
the-politician
columbo
phil-of-the-future
birds-of-america
murder-on-the-orient-express
sing
spartacus
spin-off
anna
acting
banged-up-abroad
haider
the-comic-strip-presents
the-sabrina-the-teenage-witch-show
cape-fear-1991
the-trial-of-joan-of-arc
constantine-tv