A Catholic priest was about to finish his tour of duty, and was leaving his Mission in the jungle where he had spent years teaching the natives when he realises that the one thing he never taught them was to speak English.
So he takes the chief for a walk in the forest. He points to a tree and says to the chief, "This is a tree."
The chief looks at the tree and grunts, "Tree."
The priest pleased with the response. They walk a little farther and he points to a rock and says, "This is a rock."
The chief looks at the rock and grunts, "Rock."
The priest was really getting enthusiastic about the results when he hears a rustling in the bushes.
As he peeks over the top, he sees a couple of the locals engaged in some really heavy sexual activity.
The priest is really flustered and quickly says, "Man riding a bike."
The chief looks at the couple briefly, pulls out his blowgun and kills them.
The priest goes ballistic and yells at the chief that he has spent years teaching the tribe how to be civilised and kind to each other, so how could he kill these people in cold blood?
The chief replied, "My bike."