The missionary is pleased with the response. They walk a little farther, and the padre points to a rock and says, "This is a rock."

The padre 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 in the midst of heavy sexual activity.

The padre is really flustered and quickly says, "Riding a bike."

The chief looks at the couple briefly, pulls out his blow gun, and kills them.

The padre 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 just kill these people in cold blood that way?