Thanks to my Mom for this one:
A man was driving down the street in a lather because he had an important meeting and couldn't find a parking space. Looking up to heaven, he said, "Lord, take pity on me. If you find me a parking space, I promise to go to church every Sunday for the rest of my life and to give up swearing" Miraculously, a spot opened right in front of the building. The man looked up and said, "Never mind. I found one"