There is a famous example of a technique that takes only the first letter from each word of the phrase. That is the problem - people trying to break passwords

There is a famous example of a technique that takes only the first letter from each word of the phrase. That is the problem - people trying to break passwords use the exact same techniques. Compiling a list of ten million famous phrases is not hard. Generating a hundred commonly used variants of them is also easy. And checking one billion hashed passwords - MD5, SHA1 or SHA256 for example - takes less than one second on a current GPU.