Surrounded by Cannibals

An explorer in the deepest Amazon suddenly found himself surrounded by a bloodthirsty group of natives. Upon surveying the situation, he said quietly to himself,

"Oh God, I'm screwed."

A ray of light fell from the sky and a voice boomed out,

"No, you are not screwed. Pick up that stone at your feet and bash in the head of the chief standing in front of you."

So the explorer picked up the stone and proceeded to bash the life out of the chief. He stood above the lifeless body, breathing heavily, surrounded by 100 natives with looks of shock on their faces.

The voice boomed out again, "Okay, NOW you're screwed."