Explorer in the Amazon

Once there was an explorer lost in the deepest part of the Amazon. After a
few days, he finds himself suddenly surrounded by hundreds of
blood-thirsty natives. He looks up to the sky and says, "Oh my God, I'm
screwed!!" All of a sudden, the sky opens up, and then there is a beam of
light streaming down on him, and a voice booms out, "No, you are NOT
screwed. Pick up that stone at your foot, and smash it onto the skull of
the chief." So the explorer looks down, and sees the stone. He picks it
up, and bash the life out of the cheif, who is standing right in front of
him. And he stands on the chief, triumphant, puffing and puffing, with the
bloody stone in his hand. And the chief is down on the ground, bleeding
and lifeless, with his tribesmen in shock and disbelief. Now, the sky
opens up once again, and the voice booms out... "NOW, you're screwed."