Wow, guy had great business sense to apply for a trademark on "Let's Get Ready To Rumble" when he did as it is used all the time in sports.....

Mr. Buffer's international exposure is huge, with Europe being his largest market outside the U.S. Michael Buffer has established himself as an American sports icon and his "Let's Get Ready to Rumble®" trademark phrase, surpassing over $400,000,000 in retail sales of its licensed and branded products, has firmly positioned itself as a part of American Culture.
http://www.letsrumble.com/main.html