There were three men who died and before God would let them into heaven, God gave them a chance to come back as anything they wanted.
The first guy said, "I want to come back as myself, but 100 times smarter."
So God made him 100 times smarter.
The second guy said, "I want to be better than that guy, make me 1000 times smarter."
So God made him 1000 times smarter.
The last guy decided he would be the best. So he said, "God, make me better than both of them, make me 1,000,000 times smarter."
So God made him a woman.