Shit talkers always lose.

Ali was a big talker, but was never serious or expected to be taken seriously with his words. He was comical and witty, he pandered for the crowd, he did it as entertainment on its own.

http://www.youtube.com/watch?v=7-5_8af3TiY

I don't really consider his type of banter to be the same type of shit talking I refer to in the post. Gotta love him though, the "greatest of all time", based solely by his own words.