The Belgium anthropologist Jean Pierre Dutilleux discovered the unknown tribe called, The Toulambis, in Papua, New Guinea in 1993. The had never seen a white men before in their lives and according to them, the white men were "zombies", living dead. You can clearly see their astonishment and fear when they are offered a helping hand by Jean Pierre.
Touching video with ambient music, after 13:40 you can hear their actual voices. Jean Pierre even records a small song or conversation and plays it back for them. When they hear it you can clearly see their disbelief over such 'black magic'.
Since then their population has decimated, due to the effects of Western diseases.