Shark!
There is this atheist swimming in the ocean. All of a sudden he sees a shark in the water, so he starts swimming furiously towards his boat.
As he looks back, he sees the shark turn and head towards him. He's scared to death, and as he sees the jaws of the great white beast open, revealing its horrific teeth, the atheist screams, "Oh God! Save me!"
In an instant, time is frozen and a bright light shines down from above. The man is motionless in the water when he hears the voice of God say, "You are an atheist. Why do you call upon me when you do not believe in me?"
Confused, and knowing he can't lie, the man replies, "Well, that's true I don't believe in you, but how about the shark? Can you make the shark believe in you?"
The Lord replies, "As you wish," and the light retracts back into the heavens. The man feels the water move once again.
As the atheist looks back, he can see the jaws of the shark start to close down on him, when all of sudden the shark stops and pulls back.
Shocked, the man watches as the huge beast closes its eyes, bows its head and says, "Thank you Lord for this food which I am about to receive..."