A woman said to her husband, “dear, look at our sheet! It's too dirty. Would you like to wash it now?”

The man looked at the sheet and then thought for a while and then said, “I don't think it's necessary. We can turn the sheet over. Is that all right?”

His wife was very angry at this. “How lazy you are!” She shouted, “To tell you the truth, I turned it over last week.”