An explorer in the depths of the Amazon suddenly finds himself surrounded by a group of cannibals.
Realizing the gravity of his situation, he mutters, "Oh, God, I'm screwed."
Suddenly, the sky darkens and a voice booms, "No, you are not screwed. Pick up the stone at your feet and bash in the head of the chief standing in front of you."
So the explorer grabs the stone and bashes the life out of the chief.
Standing above the limp body and panting with exhaustion, the man looks out defiantly at the troop of cannibals, who are now yabbering furiously among themselves and sharpening their spears menacingly.
Then the voice from heaven booms again, "There... now you're screwed!"