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
the-killing
hunted
lunchbox
raised-by-wolves
escape-from-alcatraz
timeless
no-smoking
hanna
1922
ava
come-inside-my-mind
star-trek-enterprise
suburgatory
halloween-2007
my-darling-clementine
p-s-i-love-you
con-air
m
beasts-of-no-nation
love-in-time-of-cholera
blade-ii
paper-moon
entrapment
moonstruck
the-sacrifice
the-post
superman-returns
extreme-weight-loss
display-technology
demon-seed