This odd article in the NYTimes about the relationship between text-messaging and increased thumb usage includes the following account of the Guinness Book of World Records texting competition:

"The champion, Kimberly Yeo, a 23-year-old student, won the contest by typing 'The razor-toothed piranhas of the genera Serrasalmus and Pygocentrus are the most ferocious freshwater fish in the world. In reality they seldom attack a human' in 43.66 seconds, shattering the mark of 67 seconds set in September 2003."

Impressive.