A child came in exclaiming excitedly, "Dad, I got a bicycle from Mom! Do you want to see it?" Dad said, "Sure, sure!" So he went to the backyard and looked at the brand new bicycle. "Wow! That's a beautiful bicycle! Can you ride it?" The son said, "The only problem is that it's broken." So his father said, "How can it be broken? It's brand new!" And the son said, "I don't know what's wrong. But anytime I ride it, it falls down!"