A Zebra goes to heaven. He's asking Gabriel whether he is black or white. Gabriel says to ask God. So the the Zebra goes to God and and he asks him, "Am I white or black?" God responds "you are what you are." "So how do I know whether I'm white or black?" God again responds, "You are what you are." The Zebra goes back to Gabriel. "What did he say?" Gabriel asks. "I don't know what he meant, but his response was 'you are what you are.'" "That means you're white" Gabriel responded. "How do you know?" asked the Zebra. "Because if you were black, he would have said 'you is what you is."