Jeff Jensen searches the Amazon for oil with a middle-aged man and his wife Marie. One night, Jensen is startled to discover Maria holding a knife on him. His servant Luiz stops her before she can do anything. Jeff tells Luiz and his business partner Mike to take her to a head shrinker. Maria likes this idea since she hopes to talk Mike into killing Luiz. Later Luiz returns and reveals that he had been forced to kill Mike. He also adds that everything else went smoothly. He proudly displays Marie's shrunken head.
that was a 'groaner'. Headshrinker.... get it?