HOW TO CHANGE YOUR WIFE IN 30 DAYS
In the United States, a book called "HOW TO CHANGE YOUR WIFE IN 30 DAYS", sold 2 million copies in a week.
Until the author discovered that the title had a spelling error! The correct title should have been: "HOW TO CHANGE YOUR LIFE IN 30 DAYS". After correction, for a whole month, only three books were sold!!???