A newlywed couple moved to an apartment in a very busy neighborhood. On the first morning in their new home, after she had made coffee, the young bride looked through the window and watched her neighbor hanging sheets out to dry. "What dirty sheets!" she thought to herself.
"Maybe she needs to buy a different kind of detergent. I should go and teach her how to wash them properly." Every few days, she muttered the same thing to her husband with disdain while watching her neighbor hanging out the dirty laundry in the early-morning light.
A month passed, and one day the young wife was surprised to see that her neighbor was hanging out perfectly clean sheets. She exclaimed to her husband, "Look! She finally learned to wash her clothes. I wonder who taught her how."
The husband replied, "Well, in reality, darling, the only difference is that I got up early this morning and cleaned the window.
-- Author Unknown