There is a scene in the documentary Burden of Dreams where Werner Herzog is discussing with a safety expert his plan to physically drag a boat over a mountain using a series of cables in a stunt meant for the climax of his film Fitzcarraldo. "If there are sixty people, how many could die," Herzog asks. "They could go off flying like a rocket. Psshew psshew," the safety expert replies, his eyes darting upwards and to the sides as if following the trajectory of people being flung to their doom.
Fitzcarraldo is a classic Herzog film on one of his favorite themes, the hubris of man futilely fighting against a wild and untameable nature.