In The US, A Book Titled: "How To Change Your Wife In 30...

Joke: In the US, a book titled: "How to change your wife in 30 days", sold 50 million copies in one week, before the author discovered that the title had a spelling error! The correct title was: "How to change your life in 30 days". After the correction, for a whole month, one 2 copies were sold.