A Catholic Priest was about to leave His Mission in the jungles where he has spent years teaching the natives when he realizes that the one thing he never taught them was how 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 is pleased with the response. They walk a little farther and he points to a rock and says, "This is a rock." Hearing this, the chief looks and grunts, "Rock."

The Priest is 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 natives in the midst of heavy sexual activity. The Priest is really flustered and quickly responds, "Riding a bike."

The chief looks at the couple briefly, pulls out his blowgun and kills
both of them!

The Priest goes ballistic and yells at the chief that he has spent years teaching the tribe how to be civilized and kind to each other,
so how could he kill these people in cold blood that way?
The chief replies, "My bike."