Adam was walking around the garden of Eden, moping. God asked him, "What is wrong with you?" Adam replied that he was lonely and didn't have anyone to talk to.
God said that He was going to make Adam a companion and that it would be a woman. He said, "This person will gather food for you, cook for you, and when you discover clothing, she will wash it for you. She will always agree with every decision you make. She will bear your children and never ask you to get up in the middle of the night to take care of them. She will not nag you and will always be the first to admit she was wrong when you've had a disagreement. She will never have a headache and will freely give you love and passion whenever you need it.
Adam asked God, "What will this woman cost?"
God replied, "An arm and a leg."
Adam thought a moment and asked, "What can I get for a rib?"