Fake → Impaled girl

This scene is from the movie "Cannibal Holocaust" (1980).
Many people considered this movie to be made using the genuine snuff material. But it was proved false. Director Ruggero Deodato was taken to court to prove that he hasn't slain real people for his motion picture. One example the court made him prove concerned the lady impaled on the stake (please see the details of that iconic impalement scene). How it was made? A native girl sat on a bicycle seat on a pole, holding a spike of balsa wood in her mouth (it was 1980 and there were not computer graphics at that time).